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1906.06568

Hong Tao Liu

H. T. Liu, Hai Cheng Feng, Y. X. Xin, J. M. Bai, S. K. Li, and Fang Wang

Search for Intra-day Optical Variability in $\gamma$-ray--loud Blazars S5 0716+714 and 3C 273

23 pages, 8 Figures, 2 Tables, accepted for publication in The Astrophysical Journal, typos

2019, ApJ, 880, 155

10.3847/1538-4357/ab29fc

astro-ph.GA astro-ph.HE

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We present the photometric observations of blazars S5 0716+714 and 3C 273 with high temporal resolution (30--60s) in the $I$ or $R$ bands. The observations were performed with a 1.02 m optical telescope from 2007 March 07 to 2012 May 16. The $F$-test, one-way analysis of variance (ANOVA) test, and $z$-transformed discrete correlation function (ZDCF) cross-correlation zero lag test are used to search for intra-day variability (IDV). Four and five reliable IDVs survive three tests for S5 0716+714 and 3C 273, respectively. IDVs are found for S5 0716+714 and 3C 273. A flare on 2008 May 08 has $\Delta I \approx$ 0.06$\pm$0.01 mag in a duration of 0.54 hr for S5 0716+714. A flare on 2011 May 10 shows $\Delta R \approx$ 0.05$\pm$0.01 mag in a duration of 0.40 hr for 3C 273. Sharp dips appear on 2011 May 9 for 3C 273, and show $\Delta R \approx$ 0.05$\pm$0.01 mag. Under the assumptions that the IDV is tightly connected to black hole mass, $M_{\bullet}$, and that the flare durations are representative of the minimum characteristic timescales, we can estimate upper bounds to $M_{\bullet}$. In the case of the Kerr black holes, $M_{\bullet} \la 10^{8.91} M_{\odot}$ and $M_{\bullet} \la 10^{9.02} M_{\odot}$ are given for S5 0716+714 and 3C 273, respectively. These mass measurements are consistent with those measurements reported in the literatures. Also, we discuss the origins of optical variations found in this work.

[{'version': 'v1', 'created': 'Sat, 15 Jun 2019 14:20:14 GMT'} {'version': 'v2', 'created': 'Wed, 7 Aug 2019 01:08:51 GMT'}]

2019-08-09

[array(['Liu', 'H. T.', ''], dtype=object) array(['Feng', 'Hai Cheng', ''], dtype=object) array(['Xin', 'Y. X.', ''], dtype=object) array(['Bai', 'J. M.', ''], dtype=object) array(['Li', 'S. K.', ''], dtype=object) array(['Wang', 'Fang', ''], dtype=object)]

quant-ph/0403146

Anocha Yimsiriwattana

Anocha Yimsiriwattana and Samuel J. Lomonaco Jr

Distributed quantum computing: A distributed Shor algorithm

13 pages, 12 figures, extra figures are removed

10.1117/12.546504

quant-ph

We present a distributed implementation of Shor's quantum factoring algorithm on a distributed quantum network model. This model provides a means for small capacity quantum computers to work together in such a way as to simulate a large capacity quantum computer. In this paper, entanglement is used as a resource for implementing non-local operations between two or more quantum computers. These non-local operations are used to implement a distributed factoring circuit with polynomially many gates. This distributed version of Shor's algorithm requires an additional overhead of O((log N)^2) communication complexity, where N denotes the integer to be factored.

[{'version': 'v1', 'created': 'Fri, 19 Mar 2004 23:27:15 GMT'} {'version': 'v2', 'created': 'Tue, 23 Mar 2004 09:50:57 GMT'}]

2009-11-10

[array(['Yimsiriwattana', 'Anocha', ''], dtype=object) array(['Lomonaco', 'Samuel J.', 'Jr'], dtype=object)]

1706.02372

Xin Wang

Xin Wang, Howard A. Stone and Ramin Golestanian

Shape of the Growing Front of Biofilms

13 pages, 4 figures

New Journal of Physics 19.12 (2017): 125007

10.1088/1367-2630/aa983f

physics.bio-ph cond-mat.soft q-bio.CB

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The spatial organization of bacteria in dense biofilms is key to their collective behaviour, and understanding it will be important for medical and technological applications. Here we study the morphology of a compact biofilm that undergoes unidirectional growth, and determine the condition for the stability of the growing interface as a function of the nutrient concentration and mechanical tension. Our study suggests that transient behaviour may play an important role in shaping the structure of a biofilm.

[{'version': 'v1', 'created': 'Wed, 7 Jun 2017 20:28:58 GMT'}]

2019-03-05

[array(['Wang', 'Xin', ''], dtype=object) array(['Stone', 'Howard A.', ''], dtype=object) array(['Golestanian', 'Ramin', ''], dtype=object)]

1607.02145

Federico Lelli

Federico Lelli (1), Stacy S. McGaugh (1), James M. Schombert (2), and Marcel S. Pawlowski (1) ((1) Case Western Reserve University, (2) University of Oregon)

The Relation between Stellar and Dynamical Surface Densities in the Central Regions of Disk Galaxies

Accepted for publication in ApJL (6 pages, 3 figures)

10.3847/2041-8205/827/1/L19

astro-ph.GA astro-ph.CO

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We use the SPARC (Spitzer Photometry & Accurate Rotation Curves) database to study the relation between the central surface density of stars Sstar and dynamical mass Sdyn in 135 disk galaxies (S0 to dIrr). We find that Sdyn correlates tightly with Sstar over 4 dex. This central density relation can be described by a double power law. High surface brightness galaxies are consistent with a 1:1 relation, suggesting that they are self-gravitating and baryon dominated in the inner parts. Low surface brightness galaxies systematically deviate from the 1:1 line, indicating that the dark matter contribution progressively increases but remains tightly coupled to the stellar one. The observed scatter is small (~0.2 dex) and largely driven by observational uncertainties. The residuals show no correlations with other galaxy properties like stellar mass, size, or gas fraction.

[{'version': 'v1', 'created': 'Thu, 7 Jul 2016 20:00:03 GMT'}]

2016-08-17

[array(['Lelli', 'Federico', ''], dtype=object) array(['McGaugh', 'Stacy S.', ''], dtype=object) array(['Schombert', 'James M.', ''], dtype=object) array(['Pawlowski', 'Marcel S.', ''], dtype=object)]

1902.07187

Anastasios Giovanidis

Anastasios Giovanidis, Bruno Baynat, Antoine Vendeville

Performance Analysis of Online Social Platforms

Preliminary version of accepted paper at INFOCOM 2019 (Paris, France)

INFOCOM 2019, Paris, France

10.1109/INFOCOM.2019.8737539

cs.NI cs.PF

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We introduce an original mathematical model to analyze the diffusion of posts within a generic online social platform. Each user of such a platform has his own Wall and Newsfeed, as well as his own self-posting and re-posting activity. As a main result, using our developed model, we derive in closed form the probabilities that posts originating from a given user are found on the Wall and Newsfeed of any other. These probabilities are the solution of a linear system of equations. Conditions of existence of the solution are provided, and two ways of solving the system are proposed, one using matrix inversion and another using fixed-point iteration. Comparisons with simulations show the accuracy of our model and its robustness with respect to the modeling assumptions. Hence, this article introduces a novel measure which allows to rank users by their influence on the social platform, by taking into account not only the social graph structure, but also the platform design, user activity (self- and re-posting), as well as competition among posts.

[{'version': 'v1', 'created': 'Tue, 19 Feb 2019 18:38:29 GMT'}]

2019-06-25

[array(['Giovanidis', 'Anastasios', ''], dtype=object) array(['Baynat', 'Bruno', ''], dtype=object) array(['Vendeville', 'Antoine', ''], dtype=object)]

0804.0520

Vittorio Giovannetti

Vittorio Giovannetti, Simone Montangero, and Rosario Fazio

Quantum MERA Channels

4 pages, 2 figures

Phys. Rev. Lett. 101, 180503 (2008)

10.1103/PhysRevLett.101.180503

quant-ph cond-mat.str-el

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Tensor networks representations of many-body quantum systems can be described in terms of quantum channels. We focus on channels associated with the Multi-scale Entanglement Renormalization Ansatz (MERA) tensor network that has been recently introduced to efficiently describe critical systems. Our approach allows us to compute the MERA correspondent to the thermodynamic limit of a critical system introducing a transfer matrix formalism, and to relate the system critical exponents to the convergence rates of the associated channels.

[{'version': 'v1', 'created': 'Thu, 3 Apr 2008 10:44:09 GMT'} {'version': 'v2', 'created': 'Mon, 6 Oct 2008 13:18:40 GMT'} {'version': 'v3', 'created': 'Fri, 14 Nov 2008 18:14:31 GMT'}]

2009-11-13

[array(['Giovannetti', 'Vittorio', ''], dtype=object) array(['Montangero', 'Simone', ''], dtype=object) array(['Fazio', 'Rosario', ''], dtype=object)]

astro-ph/0208168

Martin White

C.S. Kochanek, Martin White, J. Huchra, L. Macri, T.H. Jarrett, S.E. Schneider, J. Mader

Clusters of galaxies in the local universe

22 pages, 15 figures

Astrophys.J.585:161-181,2003

10.1086/345896

astro-ph

We use a matched filter algorithm to find and study clusters in both N-body simulations artificially populated with galaxies and the 2MASS survey. In addition to numerous checks of the matched filter algorithm, we present results on the halo multiplicity function and the cluster number function. For a subset of our identified clusters we have information on X-ray temperatures and luminosities which we cross-correlate with optical richness and galaxy velocity dispersions. With all quantities normalized by the spherical radius corresponding to a mass overdensity of Delta_M=200 or the equivalent galaxy number overdensity of Delta_N=200Omega^{-1}~666, we find that the number of L>L_* galaxies in a cluster of mass M_{200} is log N_{*666} = (1.44 +/- 0.17)+(1.10 +/- 0.09)log(M_{200}h/10^{15}Msun) where the uncertainties are dominated by the scatter created by three choices for relating the observed quantities to the cluster mass. The region inside the virial radius has a K-band cluster mass-to-light ratio of (M/L)_K=(116 +/- 46)h which is essentially independent of cluster mass. Integrating over all clusters more massive than M_{200}=10^{14}Msun/h, the virialized regions of clusters contain ~7% of the local stellar luminosity, quite comparable to the mass fraction in such objects in currently popular LambdaCDM models.

[{'version': 'v1', 'created': 'Wed, 7 Aug 2002 22:05:29 GMT'}]

2008-11-07

[array(['Kochanek', 'C. S.', ''], dtype=object) array(['White', 'Martin', ''], dtype=object) array(['Huchra', 'J.', ''], dtype=object) array(['Macri', 'L.', ''], dtype=object) array(['Jarrett', 'T. H.', ''], dtype=object) array(['Schneider', 'S. E.', ''], dtype=object) array(['Mader', 'J.', ''], dtype=object)]

cs/0502001

Shengtian Yang

Shengtian Yang, Peiliang Qiu

Some Extensions of Gallager's Method to General Sources and Channels

submitted to 2005 IEEE International Symposium on Information Theory

cs.IT math.IT

The Gallager bound is well known in the area of channel coding. However, most discussions about it mainly focus on its applications to memoryless channels. We show in this paper that the bounds obtained by Gallager's method are very tight even for general sources and channels that are defined in the information-spectrum theory. Our method is mainly based on the estimations of error exponents in those bounds, and by these estimations we proved the direct part of the Slepian-Wolf theorem and channel coding theorem for general sources and channels.

[{'version': 'v1', 'created': 'Tue, 1 Feb 2005 02:19:01 GMT'}]

2007-07-13

[array(['Yang', 'Shengtian', ''], dtype=object) array(['Qiu', 'Peiliang', ''], dtype=object)]

0903.1291

Andrew M. Childs

Andris Ambainis, Andrew M. Childs, Fran\c{c}ois Le Gall, Seiichiro Tani

The quantum query complexity of certification

8 pages; Updated to reflect changes in final journal version and to point out that the main result only applies for k>1

Quantum Information and Computation 10, 181-188 (2010)

10.26421/QIC10.3-4

quant-ph cs.CC

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We study the quantum query complexity of finding a certificate for a d-regular, k-level balanced NAND formula. Up to logarithmic factors, we show that the query complexity is Theta(d^{(k+1)/2}) for 0-certificates, and Theta(d^{k/2}) for 1-certificates. In particular, this shows that the zero-error quantum query complexity of evaluating such formulas is O(d^{(k+1)/2}) (again neglecting a logarithmic factor). Our lower bound relies on the fact that the quantum adversary method obeys a direct sum theorem.

[{'version': 'v1', 'created': 'Fri, 6 Mar 2009 21:22:18 GMT'} {'version': 'v2', 'created': 'Mon, 6 Oct 2014 18:40:56 GMT'}]

2018-12-20

[array(['Ambainis', 'Andris', ''], dtype=object) array(['Childs', 'Andrew M.', ''], dtype=object) array(['Gall', 'François Le', ''], dtype=object) array(['Tani', 'Seiichiro', ''], dtype=object)]

1311.4050

Shunichiro Kittaka

Shunichiro Kittaka, Toshiro Sakakibara, Masato Hedo, Yoshichika Onuki, and Kazushige Machida

Verification of Anisotropic s-Wave Superconducting Gap Structure in CeRu2 from Low-Temperature Field-Angle-Resolved Specific Heat Measurements

5 pages, 5 figures

J. Phys. Soc. Jpn. 82, 123706 (2013)

10.7566/JPSJ.82.123706

cond-mat.supr-con cond-mat.str-el

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The field-angle-resolved specific heat C(T,H,phi) of the f-electron superconductor CeRu2 (Tc=6.3 K) has been measured at low temperatures down to 90 mK on two single crystals of slightly different qualities. We reveal that the C(phi) oscillation in a rotating magnetic field, originating from the gap anisotropy, diminishes at low temperatures below the characteristic field H*, as expected for an anisotropic gap without nodes. We also observe the suppression of H* by decreasing the gap anisotropy ratio $\Delta_{\rm min}/\Delta_{\rm max}$, a behavior that has been predicted from a microscopic theory for anisotropic s-wave superconductors. The present technique is established as a powerful tool for investigating minimum-gap structures as well as nodal structures.

[{'version': 'v1', 'created': 'Sat, 16 Nov 2013 12:27:49 GMT'}]

2013-11-19

[array(['Kittaka', 'Shunichiro', ''], dtype=object) array(['Sakakibara', 'Toshiro', ''], dtype=object) array(['Hedo', 'Masato', ''], dtype=object) array(['Onuki', 'Yoshichika', ''], dtype=object) array(['Machida', 'Kazushige', ''], dtype=object)]

2206.00393

Shunqi Mao

Shunqi Mao, Chaoyi Zhang, Heng Wang, Weidong Cai

Towards Generalisable Audio Representations for Audio-Visual Navigation

CVPR 2022 Embodied AI Workshop

cs.SD cs.CV cs.LG cs.RO eess.AS

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In audio-visual navigation (AVN), an intelligent agent needs to navigate to a constantly sound-making object in complex 3D environments based on its audio and visual perceptions. While existing methods attempt to improve the navigation performance with preciously designed path planning or intricate task settings, none has improved the model generalisation on unheard sounds with task settings unchanged. We thus propose a contrastive learning-based method to tackle this challenge by regularising the audio encoder, where the sound-agnostic goal-driven latent representations can be learnt from various audio signals of different classes. In addition, we consider two data augmentation strategies to enrich the training sounds. We demonstrate that our designs can be easily equipped to existing AVN frameworks to obtain an immediate performance gain (13.4%$\uparrow$ in SPL on Replica and 12.2%$\uparrow$ in SPL on MP3D). Our project is available at https://AV-GeN.github.io/.

[{'version': 'v1', 'created': 'Wed, 1 Jun 2022 11:00:07 GMT'}]

2022-06-02

[array(['Mao', 'Shunqi', ''], dtype=object) array(['Zhang', 'Chaoyi', ''], dtype=object) array(['Wang', 'Heng', ''], dtype=object) array(['Cai', 'Weidong', ''], dtype=object)]

0809.0828

Kenji Hamano

The BABAR Collaboration: B. Aubert, et al

Measurements of the Semileptonic Decays $\Bb\to D\ell\nub$ and $\Bb\to D^*\ell\nub$ Using a Global Fit to $D X\ell\nub$ Final States

18 pages, 5 figures, submitted to Physical Review D

Phys.Rev.D79:012002,2009

10.1103/PhysRevD.79.012002

BABAR-PUB-08/027, SLAC-PUB-13371

hep-ex

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Semileptonic $\bar{B}$ decays to $DX\ell\bar{\nu}$ ($\ell=e$ or $mu$) are selected by reconstructing $D0\ell$ and $D^+\ell$ combinations from a sample of 230 million $\Upsilon(4S) \to B\bar{B}$ decays recorded with the BaBar detector at the PEPII $e^+e^-$ collider at SLAC. A global fit to these samples in a 3-dimensional space of kinematic variables is used to determine the branching fractions $\mathcal{B}(B^- \to D0\ell\bar{\nu}) = (2.34 \pm 0.03 \pm 0.13) %$ and $\mathcal{B}(B^- \to D^{*0}\ell\bar{\nu}) = (5.40 \pm 0.02 \pm 0.21) %$,where the errors are statistical and systematic, respectively. The fit also determines form factor parameters in a HQET-based parameterization, resulting in $\rho_D2 = 1.20 \pm 0.04 \pm 0.07$ for $\bar{B} \to D\ell\bar{\nu}$ and $\rho_{D^*}2 = 1.22 \pm 0.02 \pm 0.07$ for $\bar{B} \to D^*\ell\bar{\nu}$ These values are used to obtain the product of the CKM matrix element $|V_{cb}|$ times the form factor at the zero recoil point for both $\bar{B} \to D\ell\bar{\nu}$ decays, $\mathcal{G}(1)|V_{cb}| = (43.1 \pm 0.8 \pm 2.3)\times 10^{-3}$, and for $\bar{B} \to D^*\ell\bar{\nu}$ decays, $\mathcal{F}(1)|V_{cb}| = (35.9 \pm 0.2 \pm 1.2)\times 10^{-3}$.

[{'version': 'v1', 'created': 'Thu, 4 Sep 2008 14:57:16 GMT'} {'version': 'v2', 'created': 'Wed, 17 Dec 2008 02:05:38 GMT'}]

2010-04-12

[array(['The BABAR Collaboration', '', ''], dtype=object) array(['Aubert', 'B.', ''], dtype=object)]

1809.06578

Carsten Schneider

Peter Paule and Carsten Schneider

Towards a symbolic summation theory for unspecified sequences

cs.SC math.CO

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The article addresses the problem whether indefinite double sums involving a generic sequence can be simplified in terms of indefinite single sums. Depending on the structure of the double sum, the proposed summation machinery may provide such a simplification without exceptions. If it fails, it may suggest a more advanced simplification introducing in addition a single nested sum where the summand has to satisfy a particular constraint. More precisely, an explicitly given parameterized telescoping equation must hold. Restricting to the case that the arising unspecified sequences are specialized to the class of indefinite nested sums defined over hypergeometric, multi-basic or mixed hypergeometric products, it can be shown that this constraint is not only sufficient but also necessary.

[{'version': 'v1', 'created': 'Tue, 18 Sep 2018 08:16:23 GMT'}]

2018-09-19

[array(['Paule', 'Peter', ''], dtype=object) array(['Schneider', 'Carsten', ''], dtype=object)]

1703.04368

Benjamin Goertzel

Ruiting Lian and Ben Goertzel and Linas Vepstas and David Hanson and Changle Zhou

Symbol Grounding via Chaining of Morphisms

cs.AI

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

A new model of symbol grounding is presented, in which the structures of natural language, logical semantics, perception and action are represented categorically, and symbol grounding is modeled via the composition of morphisms between the relevant categories. This model gives conceptual insight into the fundamentally systematic nature of symbol grounding, and also connects naturally to practical real-world AI systems in current research and commercial use. Specifically, it is argued that the structure of linguistic syntax can be modeled as a certain asymmetric monoidal category, as e.g. implicit in the link grammar formalism; the structure of spatiotemporal relationships and action plans can be modeled similarly using "image grammars" and "action grammars"; and common-sense logical semantic structure can be modeled using dependently-typed lambda calculus with uncertain truth values. Given these formalisms, the grounding of linguistic descriptions in spatiotemporal perceptions and coordinated actions consists of following morphisms from language to logic through to spacetime and body (for comprehension), and vice versa (for generation). The mapping is indicated between the spatial relationships in the Region Connection Calculus and Allen Interval Algebra and corresponding entries in the link grammar syntax parsing dictionary. Further, the abstractions introduced here are shown to naturally model the structures and systems currently being deployed in the context of using the OpenCog cognitive architecture to control Hanson Robotics humanoid robots.

[{'version': 'v1', 'created': 'Mon, 13 Mar 2017 13:06:49 GMT'}]

2017-03-14

[array(['Lian', 'Ruiting', ''], dtype=object) array(['Goertzel', 'Ben', ''], dtype=object) array(['Vepstas', 'Linas', ''], dtype=object) array(['Hanson', 'David', ''], dtype=object) array(['Zhou', 'Changle', ''], dtype=object)]

1202.3651

Arvind Ayyer

Arvind Ayyer and Dan Romik

New enumeration formulas for alternating sign matrices and square ice partition functions

35 pages

Advances in Mathematics, Volume 235 (2013), Pages 161-186

10.1016/j.aim.2012.11.006

math.CO cond-mat.stat-mech math-ph math.MP math.PR

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The refined enumeration of alternating sign matrices (ASMs) of given order having prescribed behavior near one or more of their boundary edges has been the subject of extensive study, starting with the Refined Alternating Sign Matrix Conjecture of Mills-Robbins-Rumsey, its proof by Zeilberger, and more recent work on doubly-refined and triply-refined enumeration by several authors. In this paper we extend the previously known results on this problem by deriving explicit enumeration formulas for the "top-left-bottom" (triply-refined) and "top-left-bottom-right" (quadruply-refined) enumerations. The latter case solves the problem of computing the full boundary correlation function for ASMs. The enumeration formulas are proved by deriving new representations, which are of independent interest, for the partition function of the square ice model with domain wall boundary conditions at the "combinatorial point" 2{\pi}/3.

[{'version': 'v1', 'created': 'Thu, 16 Feb 2012 17:50:04 GMT'} {'version': 'v2', 'created': 'Mon, 8 Oct 2012 23:19:36 GMT'}]

2020-06-16

[array(['Ayyer', 'Arvind', ''], dtype=object) array(['Romik', 'Dan', ''], dtype=object)]

0911.3248

Antal Jakovac

A. Jakovac

Non-universal lower bound for the shear viscosity to entropy density ratio

14 pages, 2 figures, revtex4; references added, minor corrections in the text

Phys.Rev.D81:045020,2010

10.1103/PhysRevD.81.045020

hep-th hep-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The lower bound of the shear viscosity to entropy density ratio is examined using an exact representation of the ratio through the density of states. It is shown that the lower bound in a generic physical system is not universal, its value is determined by the entropy density. Some examples of physical systems are discussed in the paper where one can expect violation of the conformal 1/4pi value.

[{'version': 'v1', 'created': 'Tue, 17 Nov 2009 10:15:55 GMT'} {'version': 'v2', 'created': 'Mon, 23 Nov 2009 10:14:13 GMT'}]

2014-11-20

[array(['Jakovac', 'A.', ''], dtype=object)]

1504.06704

Timur Mufakharov

T. Mufakharov, M. Mingaliev, Yu. Sotnikova, Ya. Naiden and A. Erkenov

The observed radio/gamma-ray emission correlation for blazars with the Fermi-LAT and the RATAN-600 data

14 pages, 5 tables, 8 figures, accepted to MNRAS

10.1093/mnras/stv772

astro-ph.HE astro-ph.GA

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We study the correlation between gamma-ray and radio band radiation for 123 blazars, using the Fermi-LAT first source catalog (1FGL) and the RATAN-600 data obtained at the same period of time (within a few months). We found an apparent positive correlation for BL Lac and flat-spectrum radio quasar (FSRQ) sources from our sample through testing the value of the Pearson product-moment correlation coefficient. The BL Lac objects show higher values of the correlation coefficient than FSRQs at all frequencies, except 21.7 GHz, and at all bands, except $10-100$ GeV, typically at high confidence level (> 99%). At higher gamma-ray energies the correlation weakens and even becomes negative for BL Lacs and FSRQs. For BL Lac blazars, the correlation of the fluxes appeared to be more sensitive to the considered gamma-ray energy band, than to the frequency, while for FSRQ sources the correlation changed notably both with the considered radio frequency and gamma-ray energy band. We used a data randomization method to quantify the significance of the computed correlation coefficients. We find that the statistical significance of the correlations we obtained between the flux densities at all frequencies and the photon flux in all gamma-ray bands below 3 GeV is high for BL Lacs (chance probability $\sim 10^{-3} - 10^{-7}$). The correlation coefficient is high and significant for the $0.1-0.3$ GeV band and low and insignificant for the $10-100$ GeV band for both types of blazars for all considered frequencies.

[{'version': 'v1', 'created': 'Sat, 25 Apr 2015 09:26:13 GMT'}]

2015-05-20

[array(['Mufakharov', 'T.', ''], dtype=object) array(['Mingaliev', 'M.', ''], dtype=object) array(['Sotnikova', 'Yu.', ''], dtype=object) array(['Naiden', 'Ya.', ''], dtype=object) array(['Erkenov', 'A.', ''], dtype=object)]

2208.00101

Vladimir Ivanov

Yu. A. Nagovitsyn and V. G. Ivanov

Addition to the Gnevyshev-Ohl rule and prediction of solar cycle 25

12 pages, 6 figures; submitted to Solar Physics

astro-ph.SR

http://creativecommons.org/licenses/by/4.0/

In addition to the Gnevyshev-Ohl rule (GOR), the relation of the odd cycle with the subsequent even one in the 22-year Hale solar cycle was found. It is shown that 3 years before the 11-year minimum $m$, the value of the relative sunspot number SN in an odd cycle is closely related to the value of the maximum in the next even cycle (correlation coefficient $\rho=0.94$), and the same relation of an odd cycle with the previous even one is weaker. Like GOR, cycles are linked in pairs, but opposite to the Rule. Based on this result, we propose to use SN$_{m-3}$ on the descending phase of the previous odd cycle as a precursor of the subsequent EVEN cycle (Figure 3a) -- a precursor called MI3E. For the prediction of an odd cycle or a prediction without consideration of parity (as in the article by Braj\v{s}a et al., 2022), this method gives less reliable results. To predict the amplitude of an ODD cycle, we propose to use the precursor of the seventh year to its maximum $M$ MA7O -- SN$_{M-7}$ on the descending phase of the previous even cycle (Figure 3b). It turned out that in this case, we can also predict the years near the maximum with a high correlation coefficient ($\rho=0.90{-}0.94$). Thus, the proposed approaches allow us to predict cycles of different parity. According to our prediction, the current solar Cycle 25 in 2023 will reach a maximum of 154 units with a prediction error of $\pm25$ (68% confidence) and $\pm53$ (95% confidence). In 2024, SN will be almost as high as in 2023 -- 147 units, so with smaller time averaging scales, the maximum will fall at the end of 2023.

[{'version': 'v1', 'created': 'Fri, 29 Jul 2022 23:18:40 GMT'}]

2022-08-02

[array(['Nagovitsyn', 'Yu. A.', ''], dtype=object) array(['Ivanov', 'V. G.', ''], dtype=object)]

2001.09161

Tony Metger

Tony Metger, Thomas Vidick

Self-testing of a single quantum device under computational assumptions

58 pages, published in Quantum

Quantum 5, 544 (2021)

10.22331/q-2021-09-16-544

quant-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Self-testing is a method to characterise an arbitrary quantum system based only on its classical input-output correlations, and plays an important role in device-independent quantum information processing as well as quantum complexity theory. Prior works on self-testing require the assumption that the system's state is shared among multiple parties that only perform local measurements and cannot communicate. Here, we replace the setting of multiple non-communicating parties, which is difficult to enforce in practice, by a single computationally bounded party. Specifically, we construct a protocol that allows a classical verifier to robustly certify that a single computationally bounded quantum device must have prepared a Bell pair and performed single-qubit measurements on it, up to a change of basis applied to both the device's state and measurements. This means that under computational assumptions, the verifier is able to certify the presence of entanglement, a property usually closely associated with two separated subsystems, inside a single quantum device. To achieve this, we build on techniques first introduced by Brakerski et al. (2018) and Mahadev (2018) which allow a classical verifier to constrain the actions of a quantum device assuming the device does not break post-quantum cryptography.

[{'version': 'v1', 'created': 'Fri, 24 Jan 2020 19:00:15 GMT'} {'version': 'v2', 'created': 'Tue, 1 Dec 2020 14:46:34 GMT'} {'version': 'v3', 'created': 'Thu, 2 Sep 2021 16:31:34 GMT'} {'version': 'v4', 'created': 'Tue, 17 May 2022 15:07:50 GMT'}]

2022-05-18

[array(['Metger', 'Tony', ''], dtype=object) array(['Vidick', 'Thomas', ''], dtype=object)]

0912.2652

Saugata Basu

Saugata Basu

A complex analogue of Toda's Theorem

31 pages. Final version to appear in Foundations of Computational Mathematics

math.AG cs.CC math.AT math.CO

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Toda \cite{Toda} proved in 1989 that the (discrete) polynomial time hierarchy, $\mathbf{PH}$, is contained in the class $\mathbf{P}^{#\mathbf{P}}$, namely the class of languages that can be decided by a Turing machine in polynomial time given access to an oracle with the power to compute a function in the counting complexity class $#\mathbf{P}$. This result, which illustrates the power of counting is considered to be a seminal result in computational complexity theory. An analogous result (with a compactness hypothesis) in the complexity theory over the reals (in the sense of Blum-Shub-Smale real machines \cite{BSS89}) was proved in \cite{BZ09}. Unlike Toda's proof in the discrete case, which relied on sophisticated combinatorial arguments, the proof in \cite{BZ09} is topological in nature in which the properties of the topological join is used in a fundamental way. However, the constructions used in \cite{BZ09} were semi-algebraic -- they used real inequalities in an essential way and as such do not extend to the complex case. In this paper, we extend the techniques developed in \cite{BZ09} to the complex projective case. A key role is played by the complex join of quasi-projective complex varieties. As a consequence we obtain a complex analogue of Toda's theorem. The results contained in this paper, taken together with those contained in \cite{BZ09}, illustrate the central role of the Poincar\'e polynomial in algorithmic algebraic geometry, as well as, in computational complexity theory over the complex and real numbers -- namely, the ability to compute it efficiently enables one to decide in polynomial time all languages in the (compact) polynomial hierarchy over the appropriate field.

[{'version': 'v1', 'created': 'Mon, 14 Dec 2009 14:50:38 GMT'} {'version': 'v2', 'created': 'Tue, 15 Dec 2009 14:31:03 GMT'} {'version': 'v3', 'created': 'Tue, 15 Dec 2009 21:43:13 GMT'} {'version': 'v4', 'created': 'Thu, 17 Dec 2009 22:08:56 GMT'} {'version': 'v5', 'created': 'Sun, 3 Jan 2010 16:46:48 GMT'} {'version': 'v6', 'created': 'Mon, 1 Mar 2010 18:49:53 GMT'} {'version': 'v7', 'created': 'Fri, 14 Oct 2011 10:06:57 GMT'}]

2011-10-17

[array(['Basu', 'Saugata', ''], dtype=object)]

1707.09014

Ritika Dusad

Azar B. Eyvazov, Ritika Dusad, Timothy J. S. Munsie, Hanna A. Dabkowska, Graeme M. Luke, Ethan R. Kassner, J.C. S\'eamus Davis and Anna Eyal

Common Glass-Forming Spin-Liquid State in the Pyrochlore Magnets Dy$_2$Ti$_2$O$_7$ and Ho$_2$Ti$_2$O$_7$

9 pages, 4 figures

Phys. Rev. B 98, 214430 (2018)

10.1103/PhysRevB.98.214430

cond-mat.str-el

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Despite a well-ordered pyrochlore crystal structure and strong magnetic interactions between the Dy$^{3+}$ or Ho$^{3+}$ ions, no long range magnetic order has been detected in the pyrochlore titanates Ho$_2$Ti$_2$O$_7$ and Dy$_2$Ti$_2$O$_7$. To explore the actual magnetic phase formed by cooling these materials, we measure their magnetization dynamics using toroidal, boundary-free magnetization transport techniques. We find that the dynamical magnetic susceptibility of both compounds has the same distinctive phenomenology, that is indistinguishable in form from that of the dielectric permittivity of dipolar glass-forming liquids. Moreover, Ho$_2$Ti$_2$O$_7$ and Dy$_2$Ti$_2$O$_7$ both exhibit microscopic magnetic relaxation times that increase along the super-Arrhenius trajectories analogous to those observed in glass-forming dipolar liquids. Thus, upon cooling below about 2K, Dy$_2$Ti$_2$O$_7$ and Ho$_2$Ti$_2$O$_7$ both appear to enter the same magnetic state exhibiting the characteristics of a glass-forming spin-liquid.

[{'version': 'v1', 'created': 'Thu, 27 Jul 2017 19:37:20 GMT'} {'version': 'v2', 'created': 'Fri, 5 Jan 2018 20:47:35 GMT'} {'version': 'v3', 'created': 'Tue, 27 Nov 2018 09:47:14 GMT'}]

2018-12-26

[array(['Eyvazov', 'Azar B.', ''], dtype=object) array(['Dusad', 'Ritika', ''], dtype=object) array(['Munsie', 'Timothy J. S.', ''], dtype=object) array(['Dabkowska', 'Hanna A.', ''], dtype=object) array(['Luke', 'Graeme M.', ''], dtype=object) array(['Kassner', 'Ethan R.', ''], dtype=object) array(['Davis', 'J. C. Séamus', ''], dtype=object) array(['Eyal', 'Anna', ''], dtype=object)]

1305.2024

Guo-Qing Zheng

S. Maeda, K. Matano, H. Sawaoka, Y. Inada, Guo-qing Zheng

Superconductivity in Tetragonal LaPt_{2-x}Ge_{2+x}

6 pages, 4 figures

J. Phys. Soc. Jpn. 82, 065002 (2013)

10.7566/JPSJ.82.065002

cond-mat.supr-con

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We find that a tetragonal CaBe_2Ge_2-type structure can be stabilized in non-stoichiometric LaPt_{2-x}Ge_{2+x}. We further discovered that tetragonal LaPt_{2-x}Ge_{2+x} with x=0.15 and 0.2 respectively superconduct at Tc=1.85 K and 1.95 K, which is about four time higher than that in monoclinic LaPt_2Ge_2.

[{'version': 'v1', 'created': 'Thu, 9 May 2013 07:54:51 GMT'}]

2013-05-10

[array(['Maeda', 'S.', ''], dtype=object) array(['Matano', 'K.', ''], dtype=object) array(['Sawaoka', 'H.', ''], dtype=object) array(['Inada', 'Y.', ''], dtype=object) array(['Zheng', 'Guo-qing', ''], dtype=object)]

2306.14414

Daniel Katz

Daniel J. Katz and Allison E. Wong

Rationality of Four-Valued Families of Weil Sums of Binomials

32 pages

math.NT cs.CR cs.IT math.CO math.IT

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We investigate the rationality of Weil sums of binomials of the form $W^{K,s}_u=\sum_{x \in K} \psi(x^s - u x)$, where $K$ is a finite field whose canonical additive character is $\psi$, and where $u$ is an element of $K^{\times}$ and $s$ is a positive integer relatively prime to $|K^\times|$, so that $x \mapsto x^s$ is a permutation of $K$. The Weil spectrum for $K$ and $s$, which is the family of values $W^{K,s}_u$ as $u$ runs through $K^\times$, is of interest in arithmetic geometry and in several information-theoretic applications. The Weil spectrum always contains at least three distinct values if $s$ is nondegenerate (i.e., if $s$ is not a power of $p$ modulo $|K^\times|$, where $p$ is the characteristic of $K$). It is already known that if the Weil spectrum contains precisely three distinct values, then they must all be rational integers. We show that if the Weil spectrum contains precisely four distinct values, then they must all be rational integers, with the sole exception of the case where $|K|=5$ and $s \equiv 3 \pmod{4}$.

[{'version': 'v1', 'created': 'Mon, 26 Jun 2023 04:32:48 GMT'}]

2023-06-27

[array(['Katz', 'Daniel J.', ''], dtype=object) array(['Wong', 'Allison E.', ''], dtype=object)]

2007.12058

Rogelio Tomas

Jose L. Abelleira, Robert B. Appleby, Sergey Arsenyev, Javier Barranco, Michael Benedikt, Maria Ilaria Besana, Oscar Blanco Garcia, Manuela Boscolo, David Boutin, Xavier Buffat, Helmut Burkhardt, Francesco Cerutti, Antoine Chance, Francesco Collamati, Emilia Cruz-Alaniz, Barbara Dalena, Michael Hofer, Barbara L. Humann, Angelo Infantino, Jacqueline Keintzel, Andy Langner, Marian Luckhof, Roman Martin, Tatiana Pieloni, Haroon Rafique, Werner Riegler, Leon Van Riesen-Haupt, Daniel Schulte, Andrei Seryi, Claudia Tambasco, Rogelio Tomas, Frank Zimmermann

FCC-hh Experimental Insertion Region Design

74 pages

physics.acc-ph hep-ex

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The Future Circular Collider study is exploring possible designs of circular colliders for the post-LHC era, as recommended by the European Strategy Group for High Energy Physics. One such option is FCC-hh, a proton-proton collider with a centre-of-mass energy of 100 TeV. The experimental insertion regions are key areas defining the performance of the collider. This paper presents the first insertion region designs with a complete assessment of the main challenges, as collision debris with two orders of magnitude larger power than current colliders, beam-beam interactions in long insertions, dynamic aperture for optics with peak $\beta$ functions one order of magnitude above current colliders, photon background from synchrotron radiation and cross talk between the insertion regions. An alternative design avoiding the use of crab cavities with a small impact on performance is also presented.

[{'version': 'v1', 'created': 'Thu, 23 Jul 2020 15:16:04 GMT'}]

2020-07-24

[array(['Abelleira', 'Jose L.', ''], dtype=object) array(['Appleby', 'Robert B.', ''], dtype=object) array(['Arsenyev', 'Sergey', ''], dtype=object) array(['Barranco', 'Javier', ''], dtype=object) array(['Benedikt', 'Michael', ''], dtype=object) array(['Besana', 'Maria Ilaria', ''], dtype=object) array(['Garcia', 'Oscar Blanco', ''], dtype=object) array(['Boscolo', 'Manuela', ''], dtype=object) array(['Boutin', 'David', ''], dtype=object) array(['Buffat', 'Xavier', ''], dtype=object) array(['Burkhardt', 'Helmut', ''], dtype=object) array(['Cerutti', 'Francesco', ''], dtype=object) array(['Chance', 'Antoine', ''], dtype=object) array(['Collamati', 'Francesco', ''], dtype=object) array(['Cruz-Alaniz', 'Emilia', ''], dtype=object) array(['Dalena', 'Barbara', ''], dtype=object) array(['Hofer', 'Michael', ''], dtype=object) array(['Humann', 'Barbara L.', ''], dtype=object) array(['Infantino', 'Angelo', ''], dtype=object) array(['Keintzel', 'Jacqueline', ''], dtype=object) array(['Langner', 'Andy', ''], dtype=object) array(['Luckhof', 'Marian', ''], dtype=object) array(['Martin', 'Roman', ''], dtype=object) array(['Pieloni', 'Tatiana', ''], dtype=object) array(['Rafique', 'Haroon', ''], dtype=object) array(['Riegler', 'Werner', ''], dtype=object) array(['Van Riesen-Haupt', 'Leon', ''], dtype=object) array(['Schulte', 'Daniel', ''], dtype=object) array(['Seryi', 'Andrei', ''], dtype=object) array(['Tambasco', 'Claudia', ''], dtype=object) array(['Tomas', 'Rogelio', ''], dtype=object) array(['Zimmermann', 'Frank', ''], dtype=object)]

1309.1937

Takayuki Kihara

Kojiro Higuchi and Takayuki Kihara

Inside the Muchnik Degrees II: The Degree Structures induced by the Arithmetical Hierarchy of Countably Continuous Functions

math.LO cs.LO

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

It is known that infinitely many Medvedev degrees exist inside the Muchnik degree of any nontrivial $\Pi^0_1$ subset of Cantor space. We shed light on the fine structures inside these Muchnik degrees related to learnability and piecewise computability. As for nonempty $\Pi^0_1$ subsets of Cantor space, we show the existence of a finite-$\Delta^0_2$-piecewise degree containing infinitely many finite-$(\Pi^0_1)_2$-piecewise degrees, and a finite-$(\Pi^0_2)_2$-piecewise degree containing infinitely many finite-$\Delta^0_2$-piecewise degrees (where $(\Pi^0_n)_2$ denotes the difference of two $\Pi^0_n$ sets), whereas the greatest degrees in these three "finite-$\Gamma$-piecewise" degree structures coincide. Moreover, as for nonempty $\Pi^0_1$ subsets of Cantor space, we also show that every nonzero finite-$(\Pi^0_1)_2$-piecewise degree includes infinitely many Medvedev (i.e., one-piecewise) degrees, every nonzero countable-$\Delta^0_2$-piecewise degree includes infinitely many finite-piecewise degrees, every nonzero finite-$(\Pi^0_2)_2$-countable-$\Delta^0_2$-piecewise degree includes infinitely many countable-$\Delta^0_2$-piecewise degrees, and every nonzero Muchnik (i.e., countable-$\Pi^0_2$-piecewise) degree includes infinitely many finite-$(\Pi^0_2)_2$-countable-$\Delta^0_2$-piecewise degrees. Indeed, we show that any nonzero Medvedev degree and nonzero countable-$\Delta^0_2$-piecewise degree of a nonempty $\Pi^0_1$ subset of Cantor space have the strong anticupping properties. Finally, we obtain an elementary difference between the Medvedev (Muchnik) degree structure and the finite-$\Gamma$-piecewise degree structure of all subsets of Baire space by showing that none of the finite-$\Gamma$-piecewise structures are Brouwerian, where $\Gamma$ is any of the Wadge classes mentioned above.

[{'version': 'v1', 'created': 'Sun, 8 Sep 2013 08:01:40 GMT'}]

2013-09-10

[array(['Higuchi', 'Kojiro', ''], dtype=object) array(['Kihara', 'Takayuki', ''], dtype=object)]

1502.00305

Vitor de Souza

C. J. Todero Peixoto and Vitor de Souza and Peter L. Biermann

Cosmic rays: the spectrum and chemical composition from $10^{10}$ to $10^{20}$ eV

10.1088/1475-7516/2015/07/042

astro-ph.HE

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The production of energetic particles in the universe remains one of the great mysteries of modern science. The mechanisms of acceleration in astrophysical sources and the details about the propagation through the galactic and extragalactic media are still to be defined. In recent years, the cosmic ray flux has been measured with high precision in the energy range from \energy{10} to \energyEV{20.5} by several experiments using different techniques. In some energy ranges, it has been possible to determine the flux of individual elements (hydrogen to iron nuclei). This paper explores an astrophysical scenario in which only our Galaxy and the radio galaxy Cen A produce all particles measured on Earth in the energy range from \energy{10} to \energyEV{20.5}. Data from AMS-02, CREAM, KASCADE, KASCADE-Grande and the Pierre Auger Observatories are considered. The model developed here is able to describe the total and individual particle flux of all experiments considered. It is shown that the theory used here is able to describe the smooth transition from space-based to ground-based measurements. The flux of each element as determined by KASCADE and KASCADE-Grande and the mass sensitivity parameter \xmax measured by the Pierre Auger Observatory above \energyEV{18} are also explored within the framework of the model. The transition from \energy{16} to \energyEV{18} is carefully analyzed. It is shown that the data measured in this energy range suggest the existence of an extra component of cosmic rays yet to be understood.

[{'version': 'v1', 'created': 'Sun, 1 Feb 2015 20:31:53 GMT'}]

2015-08-06

[array(['Peixoto', 'C. J. Todero', ''], dtype=object) array(['de Souza', 'Vitor', ''], dtype=object) array(['Biermann', 'Peter L.', ''], dtype=object)]

1702.06706

Jonas Fransson

J. Fransson and R. Somphonsane and H. Ramamoorthy and G. He and J. P. Bird

Voltage-induced suppression of weak localization in graphene

Content contained in the theory section of arXiv:1802.09922

cond-mat.mes-hall cond-mat.dis-nn cond-mat.mtrl-sci

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In this theoretical study, we explore the manner in which the quantum correction due to weak localization is suppressed in weakly-disordered graphene, when it is subjected to the application of a non-zero voltage. Using a nonequilibrium Green function approach, we address the scattering generated by the disorder up to the level of the maximally crossed diagrams, hereby capturing the interference among different, impurity-defined, Feynman paths. Our calculations of the charge current, and of the resulting differential conductance, reveal the logarithmic divergence typical of weak localization in linear transport. The main finding of our work is that the applied voltage suppresses the weak localization contribution in graphene, by introducing a dephasing time that decreases inversely with increasing voltage.

[{'version': 'v1', 'created': 'Wed, 22 Feb 2017 08:49:18 GMT'} {'version': 'v2', 'created': 'Wed, 28 Feb 2018 07:04:30 GMT'}]

2018-03-01

[array(['Fransson', 'J.', ''], dtype=object) array(['Somphonsane', 'R.', ''], dtype=object) array(['Ramamoorthy', 'H.', ''], dtype=object) array(['He', 'G.', ''], dtype=object) array(['Bird', 'J. P.', ''], dtype=object)]

1005.0557

Sven Bjarke Gudnason

Sven Bjarke Gudnason

Fractional and semi-local non-Abelian Chern-Simons vortices

LaTeX, 38 pages, 16 figures.

Nucl.Phys.B840:160-185,2010

10.1016/j.nuclphysb.2010.07.004

IFUP-TH/2010-15

hep-th

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In this paper we study fractional as well as semi-local Chern-Simons vortices in G = U(1) x SO(2M) and G = U(1) x USp(2M) theories. The master equations are solved numerically using appropriate Ansatze for the moduli matrix field. In the fractional case the vortices are solved in the transverse plane due to the broken axial symmetry of the configurations (i.e. they are non-rotational invariant). It is shown that unless the fractional vortex-centers are all coincident (i.e. local case) the ring-like flux structure, characteristic of Chern-Simons vortices, will become bell-like fluxes - just as those of the standard Yang-Mills vortices. The asymptotic profile functions are calculated in all cases and the effective size is identified.

[{'version': 'v1', 'created': 'Tue, 4 May 2010 15:29:49 GMT'}]

2010-08-17

[array(['Gudnason', 'Sven Bjarke', ''], dtype=object)]

1401.8191

Yury F. Pirogov

Yu. F. Pirogov

Scalar graviton as dark matter

6 pages. Report presented at the Intern. Session-Conference of SNP DFS RAS "Physics of Fundamental Interactions", Protvino, 5-8 November 2013

Phys. Atom. Nucl. 78, 528 (2015)

gr-qc astro-ph.CO hep-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In the report, the theory of unimodular bimode gravity built on principles of unimodular gauge invariance/relativity and general covariance is exposed. Besides the massless tensor graviton of General Relativity, the theory includes an (almost) massless scalar graviton treated as the gravitational dark matter. A spherically symmetric vacuum solution, describing the coherent scalar-graviton field for the soft-core dark halos with the asymptotically flat rotation curves, is demonstrated.

[{'version': 'v1', 'created': 'Fri, 31 Jan 2014 15:14:41 GMT'}]

2020-01-01

[array(['Pirogov', 'Yu. F.', ''], dtype=object)]

1905.02760

Christian Weiss

Christian Wei{\ss}, Thomas Skill

Sequences with almost Poissonian Pair Correlations

math.NT math.CO

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Although a generic uniformly distributed sequence has Poissonian pair correlations, only one explicit example has been found up to now. Additionally, it is even known that many classes of uniformly distributed sequences, like van der Corput sequences, Kronecker sequences and LS sequences, do not have Poissonian pair correlations. In this paper, we show that van der Corput sequences and the Kronecker sequence for the golden mean are as close to having Poissonian pair correlations as possible: they both have $\alpha$-pair correlations for all $0 < \alpha < 1$ but not for $\alpha = 1$ which corresponds to Poissonian pair correlations.

[{'version': 'v1', 'created': 'Tue, 7 May 2019 18:30:50 GMT'} {'version': 'v2', 'created': 'Mon, 8 Feb 2021 12:02:13 GMT'}]

2021-02-09

[array(['Weiß', 'Christian', ''], dtype=object) array(['Skill', 'Thomas', ''], dtype=object)]

2110.15223

Heiner Olbermann

Heiner Olbermann

Godunov variables and convex entropy for relativistic fluid dynamics with bulk viscosity

10 pages, v2: introduction modified, references added

10.1063/5.0077711

math.AP nucl-th

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Based on the conservation-dissipation formalism proposed by Zhu and collaborators we formulate a general version of the Israel-Stewart theory for relativistic fluid dynamics with bulk viscosity. Our generalization consists in allowing for a wide range of dependence of the entropy density on the bulk viscosity. We show the existence of Godunov-Boillat variables for this model. By known properties of systems possessing such variables, this provides an alternative proof of the recently established existence of solutions for the Israel-Stewart theory locally in time, and a proof that entropy production is positive across weak Lax shocks.

[{'version': 'v1', 'created': 'Thu, 28 Oct 2021 15:35:41 GMT'} {'version': 'v2', 'created': 'Tue, 8 Feb 2022 11:51:25 GMT'}]

2022-03-14

[array(['Olbermann', 'Heiner', ''], dtype=object)]

1712.00958

Shilei Li

Shilei Li, Rongzhen Jiao, and Li Yu

Femtosecond pulse with THz repetition frequency based on strong coupling between quantum emitters and a plasmonic resonator

Phys. Rev. A 97, 033811 (2018)

10.1103/PhysRevA.97.033811

physics.optics

http://creativecommons.org/licenses/by-nc-sa/4.0/

Nanoscale pulsed light is highly desirable in nano-integrated optics. In this letter, we obtained femtosecond pulses with THz repetition frequency via the strong coupling between quantum emitters (QEs) and plasmonic resonators. Our structure consists of a V-groove (VG) plasmonic resonator and a nanowire embedded with two-level QEs. The influences of the incident light intensity and QE number density on the transmission response for this hybrid system are investigated through semi-classical theory and simulation. It is found that the transmission response can be modulated to the pulse form. The reason is the strong coupling causes the output power of nanowire to behave as an oscillating form, the oscillating output power in turn causes the field amplitude in the resonator to oscillate over time. A feedback system is formed between the plasmonic resonator and the QEs in nanowire. This provides a new method for generating narrow pulsed lasers with ultrahigh repetition frequency in plasmonic systems using a continous wave input, which has potential applications in generating optical clock signals at the nanoscale.

[{'version': 'v1', 'created': 'Mon, 4 Dec 2017 08:57:44 GMT'} {'version': 'v2', 'created': 'Tue, 5 Dec 2017 01:28:13 GMT'} {'version': 'v3', 'created': 'Mon, 11 Dec 2017 13:50:03 GMT'}]

2018-03-14

[array(['Li', 'Shilei', ''], dtype=object) array(['Jiao', 'Rongzhen', ''], dtype=object) array(['Yu', 'Li', ''], dtype=object)]

math/0701452

Lars Andersson

Lars Andersson (UM and AEI), Thierry Barbot (UMPA-ENSL), Francois Beguin (LM-Orsay), Abdelghani Zeghib (UMPA-ENSL)

Cosmological time versus CMC time II: the de Sitter and anti-de Sitter cases

45 pages

AEI-2007-001

math.DG

This paper continues the investigation of constant mean curvature (CMC) time functions in maximal globally hyperbolic spatially compact spacetimes of constant sectional curvature, which was started in math.DG/0604486. In that paper, the case of flat spacetimes was considered, and in the present paper, the remaining cases of negative curvature (i.e. anti-de Sitter) spacetimes and postitive curvature (i.e. de Sitter) spacetimes is dealt with. As in the flat case, the existence of CMC time functions is obtained by using the level sets of the cosmological time function as barriers. A major part of the work consists of proving the required curvature estimates for these level sets. The nonzero curvature case presents significant new difficulties, in part due to the fact that the topological structure of nonzero constant curvature spacetimes is much richer than that of the flat spacetimes. Further, the timelike convergence condition fails for de Sitter spacetimes, and hence uniqueness for CMC hypersurfaces fails in general. We characterize those de Sitter spacetimes which admit CMC time functions (which are automatically unique), as well as those which admit CMC foliations but no CMC time function.

[{'version': 'v1', 'created': 'Tue, 16 Jan 2007 16:29:16 GMT'}]

2007-05-23

[array(['Andersson', 'Lars', '', 'UM and AEI'], dtype=object) array(['Barbot', 'Thierry', '', 'UMPA-ENSL'], dtype=object) array(['Beguin', 'Francois', '', 'LM-Orsay'], dtype=object) array(['Zeghib', 'Abdelghani', '', 'UMPA-ENSL'], dtype=object)]

1507.04006

Huanian Zhang

Tao Han (Pittsburgh U. and Tsinghua U.), Shufang Su (Arizona U. and Tsinghua U.), Yongcheng Wu (Tsinghua U.), Bin Zhang (Tsinghua U.), Huanian Zhang (Arizona U.)

Sbottom discovery via mixed decays at the LHC

26 pages and 7 figures

Phys. Rev. D 92, 115009 (2015)

10.1103/PhysRevD.92.115009

hep-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In the search for bottom squark (sbottom) in SUSY at the LHC, the common practice has been to assume a $100\%$ decay branching fraction for a given search channel. In realistic MSSM scenarios, there are often more than one significant decay modes to be present, which significantly weaken the current sbottom search limits at the LHC. On the other hand, the combination of the multiple decay modes offers alternative discovery channels for sbottom searches. In this paper, we present the sbottom decays in a few representative mass parameter scenarios. We then analyze the sbottom signal for the pair production in QCD with one sbottom decaying via $\tilde{b}\rightarrow b \chi_1^0,\ b \chi_2^0$, and the other one decaying via $\tilde{b} \rightarrow t \chi_1^\pm$. With the gaugino subsequent decaying to gauge bosons or a Higgs boson $\chi_2^0 \rightarrow Z \chi_1^0,\ h \chi_1^0$ and $\chi_1^\pm \rightarrow W^\pm \chi_1^0$, we study the reach of those signals at the 14 TeV LHC with 300 ${\rm fb^{-1}}$ integrated luminosity. For a left-handed bottom squark, we find that a mass up to 920 GeV can be discovered at 5$\sigma$ significance for 250 GeV $< m_{\chi_1^0} <$ 350 GeV, or excluded up to 1050 GeV at the 95\% confidence level for the $h$ channel ($\mu>0$); similarly, it can be discovered up to 840 GeV, or excluded up to 900 GeV at the 95\% confidence level for the $Z$ channel ($\mu<0$). The sbottom and stop signals in the same SUSY parameter scenario are combined to obtain the optimal sensitivity, which is about 150 GeV better than the individual reach of the sbottom or stop. For a right-handed bottom squark with $\tilde{b} \tilde{b}^* \rightarrow b \chi_1^0,\ t \chi_1^\pm$ channel, we find that the sbottom mass up to 880 GeV can be discovered at 5$\sigma$ significance, or excluded up to 1060 GeV at the 95\% confidence level.

[{'version': 'v1', 'created': 'Tue, 14 Jul 2015 20:05:51 GMT'} {'version': 'v2', 'created': 'Wed, 2 Nov 2016 17:21:45 GMT'} {'version': 'v3', 'created': 'Thu, 3 Nov 2016 00:56:49 GMT'}]

2016-11-04

[array(['Han', 'Tao', '', 'Pittsburgh U. and Tsinghua U.'], dtype=object) array(['Su', 'Shufang', '', 'Arizona U. and\n Tsinghua U.'], dtype=object) array(['Wu', 'Yongcheng', '', 'Tsinghua U.'], dtype=object) array(['Zhang', 'Bin', '', 'Tsinghua U.'], dtype=object) array(['Zhang', 'Huanian', '', 'Arizona U.'], dtype=object)]

1206.3606

Daniel A. Lidar

G.A. Paz-Silva and D. A. Lidar

Optimally combining dynamical decoupling and quantum error correction

6 pages, 1 figure

Scientific Reports 3, 1530 (2013)

10.1038/srep01530

quant-ph cond-mat.other

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We show how dynamical decoupling (DD) and quantum error correction (QEC) can be optimally combined in the setting of fault tolerant quantum computing. To this end we identify the optimal generator set of DD sequences designed to protect quantum information encoded into stabilizer subspace or subsystem codes. This generator set, comprising the stabilizers and logical operators of the code, minimizes a natural cost function associated with the length of DD sequences. We prove that with the optimal generator set the restrictive local-bath assumption used in earlier work on hybrid DD-QEC schemes, can be significantly relaxed, thus bringing hybrid DD-QEC schemes, and their potentially considerable advantages, closer to realization.

[{'version': 'v1', 'created': 'Fri, 15 Jun 2012 23:12:57 GMT'}]

2014-02-25

[array(['Paz-Silva', 'G. A.', ''], dtype=object) array(['Lidar', 'D. A.', ''], dtype=object)]

2012.01214

Emidio Gabrielli

Marco Fabbrichesi and Emidio Gabrielli

Searching for the dark sector in two-body anti-muon decay with the polarization of monochromatic positrons

7 pages, 4 figures. Same as published version, new results included, a few typos corrected

Phys. Rev. D 104, 015039 (2021)

10.1103/PhysRevD.104.015039

hep-ph hep-ex

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The $\mu^+ \to e^+ X$ decay, where $X$ is a dark sector boson, provides one of the strongest available bounds on the scale of dark sector interactions. The $X$ boson can be an axion or a dark photon. We show that the concurrent determination of the anti-muon and positron polarizations makes possible to distinguish with a confidence level of 99% between the two dark sector portals with as few as 6 observed events in the case of the massless dark photon. Instead, the massive spin-1, dimension 4 dark portal cannot be distinguished from the axion-like case. We also discuss the possibility that the $X$ boson be a massive spin-2 particle.

[{'version': 'v1', 'created': 'Wed, 2 Dec 2020 13:55:34 GMT'} {'version': 'v2', 'created': 'Wed, 22 Sep 2021 18:26:27 GMT'}]

2021-09-24

[array(['Fabbrichesi', 'Marco', ''], dtype=object) array(['Gabrielli', 'Emidio', ''], dtype=object)]

math/9509222

Paul G. A. Floris, Erik Koelink

A commuting q-analogue of the addition formula for disk polynomials

OP-SF 19 Sep 1995

math.QA math.CA

Starting from the addition formula for $q$-disk polynomials, which is an identity in non-commuting variables, we establish a basic analogue in commuting variables of the addition and product formula for disk polynomials. These contain as limiting cases the addition and product formula for little $q$-Legendre polynomials. As $q$ tends to $1$ the addition and product formula for disk polynomials are recovered.

[{'version': 'v1', 'created': 'Tue, 19 Sep 1995 00:00:00 GMT'}]

2016-09-06

[array(['Floris', 'Paul G. A.', ''], dtype=object) array(['Koelink', 'Erik', ''], dtype=object)]

1206.6196

Pierre-Francois Marteau

Pierre-Fran\c{c}ois Marteau (IRISA), Nicolas Bonnel (IRISA), Gilbas M\'enier (IRISA)

Discrete Elastic Inner Vector Spaces with Application in Time Series and Sequence Mining

arXiv admin note: substantial text overlap with arXiv:1101.4318

IEEE Transactions on Knowledge and Data Engineering (2012) pp 1-14

10.1109/TKDE.2012.131

cs.LG cs.DB

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

This paper proposes a framework dedicated to the construction of what we call discrete elastic inner product allowing one to embed sets of non-uniformly sampled multivariate time series or sequences of varying lengths into inner product space structures. This framework is based on a recursive definition that covers the case of multiple embedded time elastic dimensions. We prove that such inner products exist in our general framework and show how a simple instance of this inner product class operates on some prospective applications, while generalizing the Euclidean inner product. Classification experimentations on time series and symbolic sequences datasets demonstrate the benefits that we can expect by embedding time series or sequences into elastic inner spaces rather than into classical Euclidean spaces. These experiments show good accuracy when compared to the euclidean distance or even dynamic programming algorithms while maintaining a linear algorithmic complexity at exploitation stage, although a quadratic indexing phase beforehand is required.

[{'version': 'v1', 'created': 'Wed, 27 Jun 2012 07:44:15 GMT'}]

2012-06-28

[array(['Marteau', 'Pierre-François', '', 'IRISA'], dtype=object) array(['Bonnel', 'Nicolas', '', 'IRISA'], dtype=object) array(['Ménier', 'Gilbas', '', 'IRISA'], dtype=object)]

1805.01173

Sandra Korte-Kerzel

Sebastian Schr\"oders, Stefanie Sandl\"obes, Carola Birke, Matthias Loeck, Lars Peters, Christophe Tromas, Sandra Korte-Kerzel

Room temperature deformation in the Fe$_7$Mo$_6$ $\mu$-Phase

Accepted manuscript in International Journal of Plasticity

International Journal of Plasticity, Volume 108, September 2018, Pages 125-143

10.1016/j.ijplas.2018.05.002

cond-mat.mtrl-sci

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The role of TCP phases in deformation of superalloys and steels is still not fully resolved. In particular, the intrinsic deformation mechanisms of these phases are largely unknown including the active slip systems in most of these complex crystal structures. Here, we present a first detailed investigation of the mechanical properties of the Fe7Mo6 {\mu}-phase at room temperature using microcompression and nanoindentation with statistical EBSD-assisted slip trace analysis and TEM imaging. Slip occurs predominantly on the basal and prismatic planes, resulting also in decohesion on prismatic planes with high defect density. The correlation of the deformation structures and measured hardness reveals pronounced hardening where interaction of slip planes occurs and prevalent deformation at pre-existing defects.

[{'version': 'v1', 'created': 'Thu, 3 May 2018 08:57:16 GMT'} {'version': 'v2', 'created': 'Thu, 9 Aug 2018 14:23:48 GMT'} {'version': 'v3', 'created': 'Fri, 10 Aug 2018 07:56:36 GMT'}]

2018-08-13

[array(['Schröders', 'Sebastian', ''], dtype=object) array(['Sandlöbes', 'Stefanie', ''], dtype=object) array(['Birke', 'Carola', ''], dtype=object) array(['Loeck', 'Matthias', ''], dtype=object) array(['Peters', 'Lars', ''], dtype=object) array(['Tromas', 'Christophe', ''], dtype=object) array(['Korte-Kerzel', 'Sandra', ''], dtype=object)]

1703.06507

Liang-Wen Pi

Andrew Vikartofsky, Liang-Wen Pi, Anthony F. Starace

Discontinuities in the Electromagnetic Fields of Vortex Beams in the Complex Source/Sink Model

10 pages, 4 figures

Phys. Rev. A 95, 053826 (2017)

10.1103/PhysRevA.95.053826

physics.optics physics.plasm-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

An analytical discontinuity is reported in what was thought to be the discontinuity-free exact nonparaxial vortex beam phasor obtained within the complex source/sink model. This discontinuity appears for all odd values of the orbital angular momentum mode. Such discontinuities in the phasor lead to nonphysical discontinuities in the real electromagnetic field components. We identify the source of the discontinuities, and provide graphical evidence of the discontinuous real electric fields for the first and third orbital angular momentum modes. A simple means of avoiding these discontinuities is presented.

[{'version': 'v1', 'created': 'Sun, 19 Mar 2017 20:25:12 GMT'}]

2017-05-17

[array(['Vikartofsky', 'Andrew', ''], dtype=object) array(['Pi', 'Liang-Wen', ''], dtype=object) array(['Starace', 'Anthony F.', ''], dtype=object)]

1806.00101

Akash Srivastava

Akash Srivastava, Kai Xu, Michael U. Gutmann and Charles Sutton

Generative Ratio Matching Networks

ICLR 2020; Code: https://github.com/GRAM-nets

stat.ML cs.LG

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Deep generative models can learn to generate realistic-looking images, but many of the most effective methods are adversarial and involve a saddlepoint optimization, which requires a careful balancing of training between a generator network and a critic network. Maximum mean discrepancy networks (MMD-nets) avoid this issue by using kernel as a fixed adversary, but unfortunately, they have not on their own been able to match the generative quality of adversarial training. In this work, we take their insight of using kernels as fixed adversaries further and present a novel method for training deep generative models that does not involve saddlepoint optimization. We call our method generative ratio matching or GRAM for short. In GRAM, the generator and the critic networks do not play a zero-sum game against each other, instead, they do so against a fixed kernel. Thus GRAM networks are not only stable to train like MMD-nets but they also match and beat the generative quality of adversarially trained generative networks.

[{'version': 'v1', 'created': 'Thu, 31 May 2018 21:06:03 GMT'} {'version': 'v2', 'created': 'Sat, 1 Jun 2019 23:48:13 GMT'} {'version': 'v3', 'created': 'Sat, 15 Feb 2020 02:06:36 GMT'}]

2020-02-18

[array(['Srivastava', 'Akash', ''], dtype=object) array(['Xu', 'Kai', ''], dtype=object) array(['Gutmann', 'Michael U.', ''], dtype=object) array(['Sutton', 'Charles', ''], dtype=object)]

2001.05122

Tao Xin

Tao Xin, Yishan Li, Yu-ang Fan, Xuanran Zhu, Yingjie Zhang, Xinfang Nie, Jun Li, Qihang Liu, and Dawei Lu

Experimental Detection of the Quantum Phases of a Three-Dimensional Topological Insulator on a Spin Quantum Simulator

6 pages for main text+ 5 pages for supplementary information

Phys. Rev. Lett. 125, 090502 (2020)

10.1103/PhysRevLett.125.090502

quant-ph cond-mat.mes-hall

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The detection of topological phases of matter becomes a central issue in recent years. Conventionally, the realization of a specific topological phase in condensed matter physics relies on probing the underlying surface band dispersion or quantum transport signature of a real material, which may be imperfect or even absent. On the other hand, quantum simulation offers an alternative approach to directly measure the topological invariant on a universal quantum computer. However, experimentally demonstrating high-dimensional topological phases remains a challenge due to the technical limitations of current experimental platforms. Here, we investigate the three-dimensional topological insulators in the AIII (chiral unitary) symmetry class which yet lack experimental realization. Using the nuclear magnetic resonance system, we experimentally demonstrate their topological properties, where a dynamical quenching approach is adopted and the dynamical bulk-boundary correspondence in the momentum space is observed. As a result, the topological invariants are measured with high precision on the band-inversion surface, exhibiting robustness to the decoherence effect. Our work paves the way towards the quantum simulation of topological phases of matter in higher dimensions and more complex systems through controllable quantum phases transitions.

[{'version': 'v1', 'created': 'Wed, 15 Jan 2020 03:51:48 GMT'}]

2020-09-02

[array(['Xin', 'Tao', ''], dtype=object) array(['Li', 'Yishan', ''], dtype=object) array(['Fan', 'Yu-ang', ''], dtype=object) array(['Zhu', 'Xuanran', ''], dtype=object) array(['Zhang', 'Yingjie', ''], dtype=object) array(['Nie', 'Xinfang', ''], dtype=object) array(['Li', 'Jun', ''], dtype=object) array(['Liu', 'Qihang', ''], dtype=object) array(['Lu', 'Dawei', ''], dtype=object)]

1302.3216

Anthony Clark

Anthony J. Clark, Jay McCarty, Ivan Y. Lyubimov, and Marina G. Guenza

Thermodynamic consistency in variable-level coarse-graining of polymeric liquids

A. J. Clark, J. McCarty, I. Y. Lyubimov, and M. G. Guenza, Phys. Rev. Lett. 109, 168301 (2012)

10.1103/PhysRevLett.109.168301

cond-mat.soft

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Numerically optimized reduced descriptions of macromolecular liquids often present thermodynamic inconsistency with atomistic level descriptions even if the total correlation function, i.e. the structure, appears to be in agreement. An analytical expression for the effective potential between a pair of coarse-grained units is derived starting from the first-principles Ornstein-Zernike equation, for a polymer liquid where each chain is represented as a collection of interpenetrating blobs, with a variable number of blobs, $n_b$, of size $N_b$. The potential is characterized by a long tail, slowly decaying with characteristic scaling exponent of $N_b^{1/4}$. This general result applies to any coarse-grained model of polymer melts with units larger than the persistence length, highlighting the importance of the long, repulsive, potential tail for the model to correctly predict both structural and thermodynamic properties of the macromolecular liquid.

[{'version': 'v1', 'created': 'Wed, 13 Feb 2013 20:55:26 GMT'}]

2013-02-14

[array(['Clark', 'Anthony J.', ''], dtype=object) array(['McCarty', 'Jay', ''], dtype=object) array(['Lyubimov', 'Ivan Y.', ''], dtype=object) array(['Guenza', 'Marina G.', ''], dtype=object)]

1705.04801

Erik Slivken

Samuel Miner and Douglas Rizzolo and Erik Slivken

Asymptotic distribution of fixed points of pattern-avoiding involutions

16 pages

Discrete Mathematics & Theoretical Computer Science, Vol. 19 no. 2, Permutation Patterns 2016, Permutation Patterns (December 11, 2017) dmtcs:3658

10.23638/DMTCS-19-2-5

math.CO math.PR

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

For a variety of pattern-avoiding classes, we describe the limiting distribution for the number of fixed points for involutions chosen uniformly at random from that class. In particular we consider monotone patterns of arbitrary length as well as all patterns of length 3. For monotone patterns we utilize the connection with standard Young tableaux with at most $k$ rows and involutions avoiding a monotone pattern of length $k$. For every pattern of length 3 we give the bivariate generating function with respect to fixed points for the involutions that avoid that pattern, and where applicable apply tools from analytic combinatorics to extract information about the limiting distribution from the generating function. Many well-known distributions appear.

[{'version': 'v1', 'created': 'Sat, 13 May 2017 08:53:56 GMT'} {'version': 'v2', 'created': 'Sun, 26 Nov 2017 11:54:37 GMT'} {'version': 'v3', 'created': 'Fri, 8 Dec 2017 15:52:18 GMT'}]

2023-06-22

[array(['Miner', 'Samuel', ''], dtype=object) array(['Rizzolo', 'Douglas', ''], dtype=object) array(['Slivken', 'Erik', ''], dtype=object)]

1502.05636

Maxence Lepers

R. Vexiau (LAC), M. Lepers (LAC), M. Aymar (LAC), N. Bouloufa-Maafa (LAC), O. Dulieu (LAC)

Long-range interactions between polar bialkali ground-state molecules in arbitrary vibrational levels

physics.atom-ph quant-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We have calculated the isotropic $C\_6$ coefficients characterizing the long-range van der Waals interaction between two identical heteronuclear alkali-metal diatomic molecules in the same arbitrary vibrational level of their ground electronic state $X^1\Sigma^+$. We consider the ten species made up of $^7$Li, $^{23}$Na, $^{39}$K, $^{87}$Rb and $^{133}$Cs. Following our previous work [M.~Lepers \textit{et.~al.}, Phys.~Rev.~A \textbf{88}, 032709 (2013)] we use the sum-over-state formula inherent to the second-order perturbation theory, composed of the contributions from the transitions within the ground state levels, from the transition between ground-state and excited state levels, and from a crossed term. These calculations involve a combination of experimental and quantum-chemical data for potential energy curves and transition dipole moments. We also investigate the case where the two molecules are in different vibrational levels and we show that the Moelwyn-Hughes approximation is valid provided that it is applied for each of the three contributions to the sum-over-state formula. Our results are particularly relevant in the context of inelastic and reactive collisions between ultracold bialkali molecules, in deeply bound or in Feshbach levels.

[{'version': 'v1', 'created': 'Thu, 19 Feb 2015 17:23:28 GMT'}]

2015-02-20

[array(['Vexiau', 'R.', '', 'LAC'], dtype=object) array(['Lepers', 'M.', '', 'LAC'], dtype=object) array(['Aymar', 'M.', '', 'LAC'], dtype=object) array(['Bouloufa-Maafa', 'N.', '', 'LAC'], dtype=object) array(['Dulieu', 'O.', '', 'LAC'], dtype=object)]

1006.2596

Kenji Fukushima

Kenji Fukushima

Phase diagram of hot and dense QCD constrained by the Statistical Model

5 pages, 3 figures; all figures updated, results and conclusions not modified

Phys.Lett.B695:387-391,2011

10.1016/j.physletb.2010.11.040

YITP-10-46

hep-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We propose a prescription to constrain the chiral effective model approach to the QCD phase diagram using the thermal Statistical Model, which is a description consistent with the experimental data at the freeze-out. In the transition region where thermal quantities of hadrons blow up, deconfined quarks and gluons should smoothly take over the degrees of freedom from hadrons in the Statistical Model. We use the Polyakov-loop coupled Nambu--Jona-Lasinio (PNJL) model as an effective description in the quark side. We require that the validity regions of these descriptions should have an overlap on the phase diagram, which constrains model uncertainty. Our results favor a phase diagram with the chiral phase transition located at slightly higher temperature than deconfinement.

[{'version': 'v1', 'created': 'Mon, 14 Jun 2010 04:27:17 GMT'} {'version': 'v2', 'created': 'Wed, 30 Jun 2010 10:24:55 GMT'}]

2011-06-27

[array(['Fukushima', 'Kenji', ''], dtype=object)]

hep-ph/9711305

Tord Riemann

Tord Riemann

The Z Boson Resonance and Radiative Corrections

15 pages, Latex, Lecture given at XXI School of Theoretical Physics of the University of Silesia, Katowice, 19-24 September 1997, Ustron, Poland

Acta Phys.Polon. B28 (1997) 2317-2332

DESY 97-218

hep-ph

The Z line shape is measured at LEP with an accuracy at the per mille level. Usually it is described in the Standard Model of electroweak interactions with account of quantum corrections. Alternatively, one may attempt different model-independent approaches in order to extract quantities like mass and width of the Z boson. If a fit deviates from that in the standard approach, this may give hints for New Physics contributions. I describe two model-independent approaches and compare their applications to LEP data with the Standard Model approach.

[{'version': 'v1', 'created': 'Wed, 12 Nov 1997 12:37:29 GMT'}]

2007-05-23

[array(['Riemann', 'Tord', ''], dtype=object)]

1701.03467

Dane Kleiner

Dane Kleiner, Kevin A. Pimbblet, D. Heath Jones, B\"arbel S. Koribalski and Paolo Serra

Evidence for HI replenishment in massive galaxies through gas accretion from the cosmic web

20 pages, 13 figures. Accepted in MNRAS

10.1093/mnras/stw3328

astro-ph.GA

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We examine the HI-to-stellar mass ratio (HI fraction) for galaxies near filament backbones within the nearby Universe ($d <$ 181 Mpc). This work uses the 6 degree Field Galaxy Survey and the Discrete Persistent Structures Extractor to define the filamentary structure of the local cosmic web. HI spectral stacking of HI Parkes all sky survey observations yields the HI fraction for filament galaxies and a field control sample. The HI fraction is measured for different stellar masses and fifth nearest neighbour projected densities ($\Sigma_{5}$) to disentangle what influences cold gas in galaxies. For galaxies with stellar masses log($M_{\star}$) $<$ 11 M$_{\odot}$ in projected densities 0 $\leq$ $\Sigma_{5}$ $<$ 3 galaxies Mpc$^{-2}$, all HI fractions of galaxies near filaments are statistically indistinguishable from the control sample. Galaxies with stellar masses log($M_{\star}$) $\geq$ 11 M$_{\odot}$ have a systematically higher HI fraction near filaments than the control sample. The greatest difference is 0.75 dex, which is 5.5$\sigma$ difference at mean projected densities of 1.45 galaxies Mpc$^{-2}$. We suggest that this is evidence for massive galaxies accreting cold gas from the intrafilament medium that can replenish some HI gas. This supports cold mode accretion where filament galaxies with a large gravitational potential can draw gas from the large-scale structure.

[{'version': 'v1', 'created': 'Thu, 12 Jan 2017 19:00:13 GMT'} {'version': 'v2', 'created': 'Wed, 25 Jan 2017 05:26:27 GMT'}]

2017-01-26

[array(['Kleiner', 'Dane', ''], dtype=object) array(['Pimbblet', 'Kevin A.', ''], dtype=object) array(['Jones', 'D. Heath', ''], dtype=object) array(['Koribalski', 'Bärbel S.', ''], dtype=object) array(['Serra', 'Paolo', ''], dtype=object)]

2203.10648

Zijia Cheng

Zi-Jia Cheng, Ilya Belopolski, Tyler A. Cochran, Hung-Ju Tien, Xian P. Yang, Wenlong Ma, Jia-Xin Yin, Junyi Zhang, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Guangming Cheng, Md. Shafayat Hossain, Qi Zhang, Nana Shumiya, Daniel Multer, Maksim Litskevich, Yuxiao Jiang, Nan Yao, Biao Lian, Guoqing Chang, Shuang Jia, Tay-Rong Chang, M. Zahid Hasan

Magnetization-direction-tunable kagome Weyl line

12 pages, 4 figures. Comments are welcome!

cond-mat.str-el

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Kagome magnets provide a fascinating platform for a plethora of topological quantum phenomena. Here, utilizing angle-resolved photoemission spectroscopy, we demonstrate Weyl lines with strong out-of-plane dispersion in an A-A stacked kagome magnet TbxGd1-xMn6Sn6. On the Gd rich side, the Weyl line remains nearly spin-orbit-gapless due to a remarkable cooperative interplay between Kane-Mele spin-orbit-coupling, low site symmetry and in-plane magnetic order. Under Tb substitution, the kagome Weyl line gaps due to a magnetic reorientation to out-of-plane order. Our results illustrate the magnetic moment direction as an efficient tuning knob for realizing distinct three-dimensional topological phases.

[{'version': 'v1', 'created': 'Sun, 20 Mar 2022 21:07:22 GMT'}]

2022-03-22

[array(['Cheng', 'Zi-Jia', ''], dtype=object) array(['Belopolski', 'Ilya', ''], dtype=object) array(['Cochran', 'Tyler A.', ''], dtype=object) array(['Tien', 'Hung-Ju', ''], dtype=object) array(['Yang', 'Xian P.', ''], dtype=object) array(['Ma', 'Wenlong', ''], dtype=object) array(['Yin', 'Jia-Xin', ''], dtype=object) array(['Zhang', 'Junyi', ''], dtype=object) array(['Jozwiak', 'Chris', ''], dtype=object) array(['Bostwick', 'Aaron', ''], dtype=object) array(['Rotenberg', 'Eli', ''], dtype=object) array(['Cheng', 'Guangming', ''], dtype=object) array(['Hossain', 'Md. Shafayat', ''], dtype=object) array(['Zhang', 'Qi', ''], dtype=object) array(['Shumiya', 'Nana', ''], dtype=object) array(['Multer', 'Daniel', ''], dtype=object) array(['Litskevich', 'Maksim', ''], dtype=object) array(['Jiang', 'Yuxiao', ''], dtype=object) array(['Yao', 'Nan', ''], dtype=object) array(['Lian', 'Biao', ''], dtype=object) array(['Chang', 'Guoqing', ''], dtype=object) array(['Jia', 'Shuang', ''], dtype=object) array(['Chang', 'Tay-Rong', ''], dtype=object) array(['Hasan', 'M. Zahid', ''], dtype=object)]

2101.03432

Thomas Kecker

Thomas Kecker and Galina Filipuk

Regularising Transformations for Complex Differential Equations with Movable Algebraic Singularities

27 pages

Math Phys Anal Geom 25, 9 (2022)

10.1007/s11040-022-09417-6

math.CA

http://creativecommons.org/licenses/by/4.0/

In a 1979 paper, K. Okamoto introduced the space of initial values for the six Painlev\'e equations and their associated Hamiltonian systems, showing that these define regular initial value problems at every point of an augmented phase space, a rational surface with certain exceptional divisors removed. We show that the construction of the space of initial values remains meaningful for certain classes of second-order complex differential equations, and more generally, Hamiltonian systems, where all movable singularities of all their solutions are algebraic poles (by some authors denoted the quasi-Painlev\'e property), which is a generalisation of the Painlev\'e property. The difference here is that the initial value problems obtained in the extended phase space become regular only after an additional change of dependent and independent variables. Constructing the analogue of space of initial values for these equations in this way also serves as an algorithm to single out, from a given class of equations or system of equations, those equations which are free from movable logarithmic branch points.

[{'version': 'v1', 'created': 'Sat, 9 Jan 2021 21:51:59 GMT'} {'version': 'v2', 'created': 'Mon, 7 Feb 2022 14:54:26 GMT'} {'version': 'v3', 'created': 'Mon, 28 Mar 2022 13:51:43 GMT'} {'version': 'v4', 'created': 'Tue, 29 Mar 2022 09:02:48 GMT'}]

2022-03-30

[array(['Kecker', 'Thomas', ''], dtype=object) array(['Filipuk', 'Galina', ''], dtype=object)]

astro-ph/0004143

Dmitri Khokhlov

D.L. Khokhlov

Neutrino-antineutrino transition under CP-transformation and solar neutrino puzzle

This paper has been withdrawn

astro-ph

This paper has been withdrawn by the author due to the presented idea is wrong.

[{'version': 'v1', 'created': 'Tue, 11 Apr 2000 14:52:38 GMT'} {'version': 'v2', 'created': 'Fri, 5 Dec 2003 16:57:00 GMT'}]

2007-05-23

[array(['Khokhlov', 'D. L.', ''], dtype=object)]

1808.06983

Andr\'es E. Piatti

A.E. Piatti, N. Hwang, A.A. Cole, M.S. Angelo and B. Emptage

Accurate radial velocity and metallicity of the Large Magellanic Cloud old globular clusters NGC 1928 and NGC 1939

10 pages, 9 figures. Accepted for publication in Monthly Notices of the Royal Astronomical Society

10.1093/mnras/sty2324

astro-ph.GA

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We present results obtained from spectroscopic observations of red giants located in the fields of the Large Magellanic Cloud (LMC) globular clusters (GCs) NGC 1928 and NGC 1939. We used the GMOS and AAOmega+2dF spectrographs to obtain spectra centred on the CaII triplet, from which we derived individual radial velocities (RVs) and metallicities. From cluster members we derived mean RVs of RV_NGC1928=249.58+-4.65 km/s and RV_NGC939=258.85+-2.08 km/s, and mean metallicities of [Fe/H]_NGC1928=-1.30+-0.15 dex and [Fe/H]_NGC1939=-2.00+-0.15 dex. We found that both GCs have RVs and positions consistent with being part of the LMC disc, so that we rule out any possible origin but that in the same galaxy. By computing the best solution of a disc that fully contains each GC, we obtained circular velocities for the 15 known LMC GCs. We found that 11/15 of the GCs share the LMC rotation derived from $HST$ and $Gaia$ DR2 proper motions. This outcome reveals that the LMC disc existed since the very early epoch of the galaxy formation and experienced the steep relatively fast chemical enrichment shown by its GC metallicities. The four remaining GCs turned out to have circular velocities not compatible with an in situ cluster formation, but rather with being stripped from the SMC.

[{'version': 'v1', 'created': 'Tue, 21 Aug 2018 16:02:51 GMT'}]

2018-08-29

[array(['Piatti', 'A. E.', ''], dtype=object) array(['Hwang', 'N.', ''], dtype=object) array(['Cole', 'A. A.', ''], dtype=object) array(['Angelo', 'M. S.', ''], dtype=object) array(['Emptage', 'B.', ''], dtype=object)]

1306.6894

Egger Daniel

D. J. Egger and F. K. Wilhelm

Optimized controlled Z gates for two superconducting qubits coupled through a resonator

10.1088/0953-2048/27/1/014001

quant-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Superconducting qubits are a promising candidate for building a quantum computer. A continued challenge for fast yet accurate gates to minimize the effects of decoherence. Here we apply numerical methods to design fast entangling gates, specifically the controlled Z, in an architecture where two qubits are coupled via a resonator. We find that the gates can be sped up by a factor of two and reach any target fidelity. We also discuss how systematic errors arising from experimental conditions affect the pulses and how to remedy them, providing a strategy for the experimental implementation of our results. We discuss the shape of the pulses, their spectrum and symmetry.

[{'version': 'v1', 'created': 'Fri, 28 Jun 2013 17:07:48 GMT'}]

2015-06-16

[array(['Egger', 'D. J.', ''], dtype=object) array(['Wilhelm', 'F. K.', ''], dtype=object)]

0903.2105

Frederic Klopp

Fr\'ed\'eric Klopp (LAGA), Shu Nakamura

Lifshitz Tails for Generalized Alloy Type Random Schr\"odinger Operators

math-ph math.MP

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We study Lifshitz tails for random Schr\"odinger operators where the random potential is alloy type in the sense that the single site potentials are independent, identically distributed, but they may have various function forms. We suppose the single site potentials are distributed in a finite set of functions, and we show that under suitable symmetry conditions, they have Lifshitz tail at the bottom of the spectrum except for special cases. When the single site potential is symmetric with respect to all the axes, we give a necessary and sufficient condition for the existence of Lifshitz tails. As an application, we show that certain random displacement models have Lifshitz singularity at the bottom of the spectrum, and also complete the study of continuous Anderson type models undertaken in arXiv : 0804.4079

[{'version': 'v1', 'created': 'Thu, 12 Mar 2009 07:28:08 GMT'} {'version': 'v2', 'created': 'Mon, 16 Mar 2009 05:33:27 GMT'}]

2009-03-16

[array(['Klopp', 'Frédéric', '', 'LAGA'], dtype=object) array(['Nakamura', 'Shu', ''], dtype=object)]

astro-ph/0110292

Angela Iovino

M. Massarotti (Oss. Astron. Capodimonte), A. Iovino (Oss. Astron. Brera), A. Buzzoni (TNG, Oss. Astron. Brera), D. Valls--Gabaud (Obs. Midi-Pyrenees)

New insights on the accuracy of photometric redshift measurements

18 pages, 9 encapsulated postscript figures, LateX, accepted for publication in A&A

10.1051/0004-6361:20011409

astro-ph

We use the deepest and most complete redshift catalog currently available (the Hubble Deep Field (HDF) North supplemented by new HDF South redshift data) to minimize residuals between photometric and spectroscopic redshift estimates. The good agreement at z_spec < 1.5 shows that model libraries provide a good description of the galaxy population. At z_spec > 2.0, the systematic shift between photometric and spectroscopic redshifts decreases when the modeling of the absorption by the interstellar and intergalactic media is refined. As a result, in the entire redshift range 0 < z < 6, residuals between photometric and spectroscopic redshifts are roughly halved. For objects fainter than the spectroscopic limit, the main source of uncertainty in photometric redshifts is related to photometric errors, and can be assessed with Monte Carlo simulations.

[{'version': 'v1', 'created': 'Fri, 12 Oct 2001 09:24:33 GMT'}]

2016-08-30

[array(['Massarotti', 'M.', '', 'Oss. Astron. Capodimonte'], dtype=object) array(['Iovino', 'A.', '', 'Oss. Astron.\n Brera'], dtype=object) array(['Buzzoni', 'A.', '', 'TNG, Oss. Astron. Brera'], dtype=object) array(['Valls--Gabaud', 'D.', '', 'Obs.\n Midi-Pyrenees'], dtype=object)]

1909.11528

Jordi Borras

Jordi Borras and Gregori Vazquez

Context-Aware Decentralized Invariant Signaling for Opportunistic Communications

This paper was rejected. The authors decided to keep working and improving this work. Currently, a more sophisticated work based on the rejected paper is being written, which can be of major interest to anyone interested in this research topic. The authors will upload this new work as soon as possible

cs.IT math.IT

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

A novel scenario-adapted distributed signaling technique in the context of opportunistic communications is presented in this work. Each opportunistic user acquires locally sampled observations from the wireless environment to determine the occupied and available degrees-of-freedom (DoF). Due to sensing errors and locality of observations, a performance loss and inter-system interference arise from subspace uncertainties. Yet, we show that addressing the problem as a total least-squares (TLS) optimization, signaling patterns robust to subspace uncertainties can be designed. Furthermore, given the equivalence of minimum norm and TLS, the latter exhibits the interesting properties of linear predictors. Specifically, the rotationally invariance property is of paramount importance to guarantee the detectability by neighboring nodes. Albeit these advantages, end-to-end subspace uncertainties yield a performance loss that compromises both detectability and wireless environment's performance. To combat the latter, we tackle the distributed identification of the active subspace with and without side information about neighboring nodes' subspaces. An extensive simulation analysis highlights the performance of distributed concurrency schemes to achieve subspace agreement.

[{'version': 'v1', 'created': 'Wed, 25 Sep 2019 14:37:36 GMT'} {'version': 'v2', 'created': 'Fri, 29 Oct 2021 09:44:47 GMT'}]

2021-11-01

[array(['Borras', 'Jordi', ''], dtype=object) array(['Vazquez', 'Gregori', ''], dtype=object)]

hep-th/0003182

Alexander Kapustnikov

A. A. Kapustnikov

Superextension n=(2,2) of the complex Liouville equation and its solution

11 pages, LaTeX, talk given at the XIV-th Max Born Symposium, Karpacz, Poland, September 21-25, 1999

10.1142/9789812793263_0019

hep-th

It is shown that the method of the nonlinear realization of local supersymmetry previously developed in framework of supergravity being applied to the n=(2,2) superconformal symmetry allows one to get the new form of the exactly solvable n=(2,2) super-Liouville equation. The general advantage of this version as compared with the conventional one is that its bosonic part includes the complex Liouville equation. We obtain the suitable supercovariant constraints imposed on the corresponding superfields which provide the set of the resulting system of component equations be the same as that in model of N=2, D=4 Green-Schwarz superstring. The general solution of this system is derived from the corresponding solution of the bosonic string equation.

[{'version': 'v1', 'created': 'Tue, 21 Mar 2000 07:28:05 GMT'}]

2016-11-23

[array(['Kapustnikov', 'A. A.', ''], dtype=object)]

1812.09279

Sherry Chu

Sherry Chu, Mehran Kardar, David R. Nelson, and Daniel A. Beller

Evolution in range expansions with competition at rough boundaries

physics.bio-ph cond-mat.stat-mech

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

When a biological population expands into new territory, genetic drift develops an enormous influence on evolution at the propagating front. In such range expansion processes, fluctuations in allele frequencies occur through stochastic \textit{spatial} wandering of both genetic lineages and the boundaries between genetically segregated sectors. Laboratory experiments on microbial range expansions have shown that this stochastic wandering, transverse to the front, is superdiffusive due to the front's growing roughness, implying much faster loss of genetic diversity than predicted by simple flat front diffusive models. We study the evolutionary consequences of this superdiffusive wandering using two complementary numerical models of range expansions: the stepping stone model, and a new interpretation of the model of directed paths in random media, in the context of a roughening population front. Through these approaches we compute statistics for the times since common ancestry for pairs of individuals with a given spatial separation at the front, and we explore how environmental heterogeneities can locally suppress these superdiffusive fluctuations.

[{'version': 'v1', 'created': 'Fri, 21 Dec 2018 17:42:44 GMT'}]

2018-12-24

[array(['Chu', 'Sherry', ''], dtype=object) array(['Kardar', 'Mehran', ''], dtype=object) array(['Nelson', 'David R.', ''], dtype=object) array(['Beller', 'Daniel A.', ''], dtype=object)]

hep-ph/0602219

Sergey Afonin

S.S. Afonin and D. Espriu

Qualitative solution of QCD sum rules

Version published in JHEP

JHEP 0609 (2006) 047

10.1088/1126-6708/2006/09/047

UB-ECM-PF-06/08

hep-ph

We show how such important features of QCD as chiral symmetry breaking or the formation of a mass-gap can be directly traced from QCD sum rules for two point functions assuming, in the large number of colors limit, exact duality between the operator product expansion and the spectrum described by linearly (or nearly linear) rising Regge trajectories as predicted by string theory. We see how the presence of chiral symmetry breaking is intimately related to confinement in this scenario, as expected from general arguments, and how Regge trajectories change when chiral symmetry is broken. As a result the whole meson mass spectrum can be parametrized with a good accuracy by the constant $f_{\pi}$ only, thus realizing the program proposed by Migdal some time ago.

[{'version': 'v1', 'created': 'Thu, 23 Feb 2006 20:55:02 GMT'} {'version': 'v2', 'created': 'Tue, 7 Mar 2006 16:59:04 GMT'} {'version': 'v3', 'created': 'Mon, 2 Oct 2006 13:55:07 GMT'}]

2009-11-11

[array(['Afonin', 'S. S.', ''], dtype=object) array(['Espriu', 'D.', ''], dtype=object)]

0804.1764

Friedwardt Winterberg

Friedwardt Winterberg

Attainment of Gigavolt Potentials by Fluid Dynamic Suppression of the Stepped Leader its Significance for Thermonuclear Ignition

9 pages, 1 figure

physics.acc-ph physics.plasm-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

It is proposed to levitate a conducting sphere in a high pressure Taylor flow and to charge it up to gigavolt potentials, either mechanically as in a Van de Graaff electrostatic generator, or inductively by a rising magnetic field. If the Taylor flow is sufficiently fast, it should overcome the electric pressure and breakdown by stepped leader formation, leading to the maximum attainable voltage by the Paschen law. Discharging the electrostatically stored energy can be done by controlled breakdown. With gigajoule energies stored and released in about 10^-8 sec, this implies and electric pulse power of the order 10^17 Watt, opening the prospect of large driver energies for thermonuclear ignition.

[{'version': 'v1', 'created': 'Thu, 10 Apr 2008 17:14:24 GMT'} {'version': 'v2', 'created': 'Tue, 13 May 2008 17:53:14 GMT'}]

2008-05-13

[array(['Winterberg', 'Friedwardt', ''], dtype=object)]

0706.4380

Thorsten Renk

Thorsten Renk, Kari J. Eskola

Prospects of Jet Tomography Using Hard Processes inside a Soft Medium

10 pages, 7 figures, talk given at the workshop 'High p_T physics at the LHC', University of Jyvaskyla, Jyvaskyla, Finland, 23-27 March, 2007

PoSLHC07:032,2007

hep-ph

The term 'tomography' is commonly applied to the idea of studying properties of a medium by the modifications this medium induces to a known probe propagating through it. In the context of ultrarelativistic heavy-ion collisions, rare high transverse momentum (p_T) processes taking place alongside soft bulk-matter production can be viewed as a tomographic probe as long as the energy scales are such that the modification of high p_T processes can be dominantly ascribed to interactions with the medium during the propagation of partons. Various high p_T observables have been suggested for tomography, among them hard single hadron suppression, dihadron correlations and gamma-hadron correlations. In this paper, we present a model study of a number of different observables within the same calculational framework to assess the sensitivity of the observables to different properties of the medium and discuss the prospects of obtaining tomographic information.

[{'version': 'v1', 'created': 'Fri, 29 Jun 2007 10:13:46 GMT'}]

2008-11-26

[array(['Renk', 'Thorsten', ''], dtype=object) array(['Eskola', 'Kari J.', ''], dtype=object)]

1505.06705

Paola Arias

Paola Arias, Edwin Ireson, Fidel A. Schaposnik and Gianni Tallarita

Chern-Simons-Higgs Theory with Visible and Hidden Sectors and its ${\cal N}=2$ SUSY Extension

10 pages, 12 figures. Several typos fixed and the Gauss law is explicitly written, figures correctly shown. Accepted in PLB

10.1016/j.physletb.2015.08.005

hep-th hep-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We study vortex solutions in Abelian Chern-Simons-Higgs theories with visible and hidden sectors. We first consider the case in which the two sectors are connected through a BF-like gauge mixing term with no explicit interaction between the the two scalars. Since first order Bogomolny equations do not exist in this case, we derive the second order field equations. We then proceed to an ${\cal N}=2$ supersymmetric extension including a Higgs portal mixing among the visible and hidden charged scalars. As expected, Bogomolnyi equations do exist in this case and we study their string-like solutions numerically.

[{'version': 'v1', 'created': 'Mon, 25 May 2015 17:57:55 GMT'} {'version': 'v2', 'created': 'Fri, 14 Aug 2015 04:23:46 GMT'} {'version': 'v3', 'created': 'Mon, 17 Aug 2015 17:20:11 GMT'}]

2015-08-18

[array(['Arias', 'Paola', ''], dtype=object) array(['Ireson', 'Edwin', ''], dtype=object) array(['Schaposnik', 'Fidel A.', ''], dtype=object) array(['Tallarita', 'Gianni', ''], dtype=object)]

1804.03593

Guangxu Zhu

Yuqing Du and Guangxu Zhu and Jiayao Zhang and Kaibin Huang

Automatic Recognition of Space-Time Constellations by Learning on the Grassmann Manifold (Extended Version)

An extended version for an IEEE submission

10.1109/TSP.2018.2873542

cs.IT math.IT

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Recent breakthroughs in machine learning especially artificial intelligence shift the paradigm of wireless communication towards intelligence radios. One of their core operations is automatic modulation recognition (AMR). Existing research focuses on coherent modulation schemes such as QAM, PSK and FSK. The AMR of (non-coherent) space-time modulation remains an uncharted area despite its wide deployment in modern multiple-input-multiple-output (MIMO) systems. The scheme using a so called Grassmann constellation enables rate-enhancement using multi-antennas and blind detection. In this work, we propose an AMR approach for Grassmann constellation based on data clustering, which differs from traditional AMR based on classification using a modulation database. The approach allows algorithms for clustering on the Grassmann manifold, such as Grassmann K-means and depth-first search, originally developed for computer vision to be applied to AMR. We further develop an analytical framework for studying and designing these algorithms in the context of AMR. First, the maximum-likelihood Grassmann constellation detection is proved to be equivalent to clustering on the Grassmannian. Thereby, a well-known machine-learning result that was originally established only for the Euclidean space is rediscovered for the Grassmannian. Next, despite a rich literature on algorithmic design, theoretical analysis of data clustering is largely overlooked due to the lack of tractable techniques. We tackle the challenge by introducing probabilistic metrics for measuring the inter-cluster separability and intra-cluster connectivity of received space-time symbols and deriving them using tools from differential geometry and Grassmannian packing. The results provide useful insights into the effects of various parameters ranging from the signal-to-noise ratio to constellation size, facilitating algorithmic design.

[{'version': 'v1', 'created': 'Tue, 10 Apr 2018 15:40:29 GMT'} {'version': 'v2', 'created': 'Wed, 11 Apr 2018 15:51:55 GMT'}]

2018-11-14

[array(['Du', 'Yuqing', ''], dtype=object) array(['Zhu', 'Guangxu', ''], dtype=object) array(['Zhang', 'Jiayao', ''], dtype=object) array(['Huang', 'Kaibin', ''], dtype=object)]

0706.2412

Christian Corda cordac

Christian Corda

Generalized gauge-invariance for gravitational waves

This paper has been withdrawn by the author because an improved and updated version has been put in the archive

gr-qc

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The aim of this paper is to show the gauge-invariance on the response of interferometers to gravitational waves (GWs). In this process, after a review of results on the Tranverse-Traceless (TT) gauge, where, in general, the theoretical computations on GWs are performed, which is due for completness, we analyse the gauge of the local observer, which represents the gauge of a laboratory environment on Earth. The gauge-invariance between the two gauges is shown in its full angular and frequency dependences. In previous works in the literature this gauge-invariance was shown only in the low frequencies approximation or in the simplest geometry of the interferometer in respect to the propagating GW (i.e. both of the arms of the interferometer are perpendicular to the propagating GW). As far as the computation of the response functions in the gauge of the local observer is concerned, a common misconception about interferometers is also clarifed.

[{'version': 'v1', 'created': 'Sat, 16 Jun 2007 10:43:36 GMT'} {'version': 'v2', 'created': 'Fri, 30 May 2008 13:24:47 GMT'} {'version': 'v3', 'created': 'Mon, 15 Sep 2008 05:14:55 GMT'} {'version': 'v4', 'created': 'Thu, 18 Sep 2008 09:42:54 GMT'} {'version': 'v5', 'created': 'Thu, 16 Oct 2008 13:30:16 GMT'} {'version': 'v6', 'created': 'Thu, 24 Mar 2011 15:26:44 GMT'}]

2011-03-25

[array(['Corda', 'Christian', ''], dtype=object)]

0802.3180

Daniel Gomez Vergel

Daniel G\'omez Vergel

Schrodinger quantization of linearly polarized Gowdy $S^1\times S^2$ and $S^3$ models coupled to massless scalar fields

18 pages. Final version to appear in Classical and Quantum Gravity

Class.Quant.Grav.25:175016,2008

10.1088/0264-9381/25/17/175016

gr-qc

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In this paper we will construct the Schrodinger representation for the linearly polarized Gowdy $S^1\times S^2$ and $S^3$ models coupled to massless scalar fields. Here the quantum states belong to a $L^2$-space for a suitable quantum configuration space endowed with a Gaussian measure, whose support is analyzed. This study completes the quantization of these systems previously performed in the Fock scheme, and provides a specially useful framework to address physically relevant questions.

[{'version': 'v1', 'created': 'Thu, 21 Feb 2008 18:01:02 GMT'} {'version': 'v2', 'created': 'Tue, 27 May 2008 14:27:46 GMT'} {'version': 'v3', 'created': 'Wed, 23 Jul 2008 12:53:35 GMT'}]

2008-11-26

[array(['Vergel', 'Daniel Gómez', ''], dtype=object)]

2301.02567

Boris N. Narozhny

Narozhny B.N

Hydrodynamic approach to many-body systems: exact conservation laws

23 pages

Annals of Physics 454, 169341 (2023)

10.1016/j.aop.2023.169341

cond-mat.str-el cond-mat.mes-hall

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In this paper I present a pedagogical derivation of continuity equations manifesting exact conservation laws in an interacting electronic system based on the nonequilibrium Keldysh technique. The purpose of this exercise is to lay the groundwork for extending the hydrodynamic approach to electronic transport to strongly correlated systems where the quasiparticle approximation and Boltzmann kinetic theory fail.

[{'version': 'v1', 'created': 'Fri, 6 Jan 2023 15:37:08 GMT'} {'version': 'v2', 'created': 'Sun, 28 May 2023 15:45:59 GMT'}]

2023-05-30

[array(['N', 'Narozhny B.', ''], dtype=object)]

2301.05166

Salvatore Ferrone

Salvatore Ferrone, Paola Di Matteo, Alessandra Mastrobuono-Battisti, Misha Haywood, Owain N. Snaith, Marco Montouri, Sergey Khoperskov, David Valls-Gabaud

The e-TidalGCs Project: Modeling the extra-tidal features generated by Galactic globular clusters

51 pages, 34 figures, Accepted for publication on A&A

A&A 673, A44 (2023)

10.1051/0004-6361/202244141

astro-ph.GA

http://creativecommons.org/licenses/by/4.0/

We present the e-TidalGCs Project which aims at modeling and predicting the extra-tidal features surrounding all Galactic globular clusters for which 6D phase space information, masses and sizes are available (currently 159 globular clusters). We focus the analysis and presentation of the results on the distribution of extra-tidal material on the sky, and on the different structures found at different heliocentric distances. We emphasize the wide variety of morphologies found: beyond the canonical tidal tails, our models reveal that the extra-tidal features generated by globular clusters take a wide variety of shapes, from thin and elongated shapes, to thick, and complex halo-like structures. We also compare some of the most well studied stellar streams found around Galactic globular clusters to our model predictions, namely those associated to the clusters NGC 3201, NGC 4590, NGC 5466 and Pal 5. Additionally, we investigate how the distribution and extension in the sky of the simulated streams vary with the Galactic potential by making use of three different models, containing or not a central spheroid, or a stellar bar. Overall, our models predict that the mass lost by the current globular cluster population in the field from the last 5 Gyrs is between $0.3-2.1\times10^{7}M_{\odot}$, an amount comparable between 7-55 % of current mass. Most of this lost mass is found in the inner Galaxy, with the half-mass radius of this population being between 4-6 kpc. The outputs of the simulations will be publicly available, at a time when the ESA Gaia mission and complementary spectroscopic surveys are delivering exquisite data to which these models can be compared.

[{'version': 'v1', 'created': 'Thu, 12 Jan 2023 17:37:29 GMT'}]

2023-05-03

[array(['Ferrone', 'Salvatore', ''], dtype=object) array(['Di Matteo', 'Paola', ''], dtype=object) array(['Mastrobuono-Battisti', 'Alessandra', ''], dtype=object) array(['Haywood', 'Misha', ''], dtype=object) array(['Snaith', 'Owain N.', ''], dtype=object) array(['Montouri', 'Marco', ''], dtype=object) array(['Khoperskov', 'Sergey', ''], dtype=object) array(['Valls-Gabaud', 'David', ''], dtype=object)]

1510.01205

Vinodh Kumar Bandaru

Vinodh Bandaru, Thomas Boeck, Dmitry Krasnov, J\"org Schumacher

A hybrid finite-difference/boundary element procedure for the simulation of turbulent MHD duct flow at finite magnetic Reynolds numbers

Journal of Computational Physics, Volume 304, pp.320-339, 2016

10.1016/j.jcp.2015.10.007

physics.flu-dyn

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

A conservative coupled finite difference-boundary element computational procedure for the simulation of turbulent magnetohydrodynamic flow in a straight rectangular duct at finite magnetic Reynolds number is presented. The flow is assumed to be periodic in the streamwise direction and is driven by a mean pressure gradient. The duct walls are considered to be electrically insulating. The co-evolution of the velocity and magnetic fields as described respectively by the Navier-Stokes and the magnetic induction equations, together with the coupling of the magnetic field between the conducting domain and the non-conducting exterior is solved using the magnetic field formulation. The aim is to simulate localized magnetic fields interacting with turbulent duct flow. Detailed verification of the implementation of the numerical scheme is conducted in the limiting case of low magnetic Reynolds number by comparing with the results obtained using a quasistatic approach that has no coupling with the exterior. The rigorous procedure with non-local magnetic boundary conditions is compared versus simplified pseudo-vacuum boundary conditions and the differences are quantified. Our first direct numerical simulations of turbulent Hartmann duct flow at moderate magnetic Reynolds numbers and a low flow Reynolds number show significant differences in the duct flow turbulence, even at low interaction level between the flow and magnetic field

[{'version': 'v1', 'created': 'Mon, 5 Oct 2015 16:14:38 GMT'}]

2015-11-05

[array(['Bandaru', 'Vinodh', ''], dtype=object) array(['Boeck', 'Thomas', ''], dtype=object) array(['Krasnov', 'Dmitry', ''], dtype=object) array(['Schumacher', 'Jörg', ''], dtype=object)]

2111.00789

Russell Buchanan

Russell Buchanan, Marco Camurri, Frank Dellaert, Maurice Fallon

Learning Inertial Odometry for Dynamic Legged Robot State Estimation

To be presented at 5th Annual Conference on Robot Learning (CoRL), 2021

cs.RO

http://creativecommons.org/licenses/by/4.0/

This paper introduces a novel proprioceptive state estimator for legged robots based on a learned displacement measurement from IMU data. Recent research in pedestrian tracking has shown that motion can be inferred from inertial data using convolutional neural networks. A learned inertial displacement measurement can improve state estimation in challenging scenarios where leg odometry is unreliable, such as slipping and compressible terrains. Our work learns to estimate a displacement measurement from IMU data which is then fused with traditional leg odometry. Our approach greatly reduces the drift of proprioceptive state estimation, which is critical for legged robots deployed in vision and lidar denied environments such as foggy sewers or dusty mines. We compared results from an EKF and an incremental fixed-lag factor graph estimator using data from several real robot experiments crossing challenging terrains. Our results show a reduction of relative pose error by 37% in challenging scenarios when compared to a traditional kinematic-inertial estimator without learned measurement. We also demonstrate a 22% reduction in error when used with vision systems in visually degraded environments such as an underground mine.

[{'version': 'v1', 'created': 'Mon, 1 Nov 2021 09:37:34 GMT'}]

2021-11-02

[array(['Buchanan', 'Russell', ''], dtype=object) array(['Camurri', 'Marco', ''], dtype=object) array(['Dellaert', 'Frank', ''], dtype=object) array(['Fallon', 'Maurice', ''], dtype=object)]

1502.02922

Amalia Coldea

M. D. Watson, T. Yamashita, S. Kasahara, W. Knafo, M. Nardone, J. Beard, F. Hardy, A. McCollam, A. Narayanan, S. F. Blake, T. Wolf, A. A. Haghighirad, C. Meingast, A. J. Schofield, H. von Lohneysen, Y. Matsuda, A. I. Coldea, and T. Shibauchi

Dichotomy between the hole and electrons behavior in the multiband FeSe probed by ultra high magnetic fields

Latex, 4 pages (2 figures, 1 table), and supplemental material

Phys. Rev. Lett. 115, 027006 (2015)

10.1103/PhysRevLett.115.027006

cond-mat.supr-con cond-mat.str-el

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Magnetoresistivity \r{ho}xx and Hall resistivity \r{ho}xy in ultra high magnetic fields up to 88T are measured down to 0.15K to clarify the multiband electronic structure in high-quality single crystals of superconducting FeSe. At low temperatures and high fields we observe quantum oscillations in both resistivity and Hall effect, confirming the multiband Fermi surface with small volumes. We propose a novel and independent approach to identify the sign of corresponding cyclotron orbit in a compensated metal from magnetotransport measurements. The observed significant differences in the relative amplitudes of the quantum oscillations between the \r{ho}xx and \r{ho}xy components, together with the positive sign of the high-field \r{ho}xy , reveal that the largest pocket should correspond to the hole band. The low-field magnetotransport data in the normal state suggest that, in addition to one hole and one almost compensated electron bands, the orthorhombic phase of FeSe exhibits an additional tiny electron pocket with a high mobility.

[{'version': 'v1', 'created': 'Tue, 10 Feb 2015 14:35:46 GMT'}]

2015-08-21

[array(['Watson', 'M. D.', ''], dtype=object) array(['Yamashita', 'T.', ''], dtype=object) array(['Kasahara', 'S.', ''], dtype=object) array(['Knafo', 'W.', ''], dtype=object) array(['Nardone', 'M.', ''], dtype=object) array(['Beard', 'J.', ''], dtype=object) array(['Hardy', 'F.', ''], dtype=object) array(['McCollam', 'A.', ''], dtype=object) array(['Narayanan', 'A.', ''], dtype=object) array(['Blake', 'S. F.', ''], dtype=object) array(['Wolf', 'T.', ''], dtype=object) array(['Haghighirad', 'A. A.', ''], dtype=object) array(['Meingast', 'C.', ''], dtype=object) array(['Schofield', 'A. J.', ''], dtype=object) array(['von Lohneysen', 'H.', ''], dtype=object) array(['Matsuda', 'Y.', ''], dtype=object) array(['Coldea', 'A. I.', ''], dtype=object) array(['Shibauchi', 'T.', ''], dtype=object)]

1404.4634

Camille Avestruz

Camille Avestruz, Erwin T. Lau, Daisuke Nagai, Alexey Vikhlinin

Testing X-ray Measurements of Galaxy Cluster Outskirts with Cosmological Simulations

13 pages, 11 figures, Accepted to ApJ

10.1088/0004-637X/791/2/117

astro-ph.CO astro-ph.GA

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The study of galaxy cluster outskirts has emerged as one of the new frontiers in extragalactic astrophysics and cosmology with the advent of new observations in X-ray and microwave. However, the thermodynamic properties and chemical enrichment of this diffuse and azimuthally asymmetric component of the intracluster medium (ICM) are still not well understood. This work, for the first time, systematically explores potential observational biases in these regions. To assess X-ray measurements of galaxy cluster properties at large radii ($>{R}_{500c}$), we use mock Chandra analyses of cosmological galaxy cluster simulations. The pipeline is identical to that used for Chandra observations, but the biases discussed in this paper are relevant for all X-ray observations outside of ${R}_{500c}$. We find the following from our analysis: (1) filament regions can contribute as much as $50\%$ at $R_{200c}$ to the emission measure; (2) X-ray temperatures and metal abundances from model fitted mock X-ray spectra in a multi-temperature ICM respectively vary to the level of $10\%$ and $50\%$; (3) resulting density profiles vary to within $10\%$ out to $R_{200c}$, and gas mass, total mass, and baryon fractions all vary to within a few percent; (4) the bias from a metal abundance extrapolated a factor of five higher than the true metal abundance results in total mass measurements biased high by $20\%$ and total gas measurements biased low by $10\%$; and (5) differences in projection and dynamical state of a cluster can lead to gas density slope measurements that differ by a factor of $15\%$ and $30\%$, respectively. The presented results can partially account for some of the recent gas profile measurements in cluster outskirts by, e.g., Suzaku. Our findings are pertinent to future X-ray cosmological constraints from cluster outskirts.

[{'version': 'v1', 'created': 'Thu, 17 Apr 2014 20:00:10 GMT'} {'version': 'v2', 'created': 'Tue, 21 Oct 2014 21:58:12 GMT'} {'version': 'v3', 'created': 'Thu, 23 Oct 2014 16:21:01 GMT'}]

2014-10-24

[array(['Avestruz', 'Camille', ''], dtype=object) array(['Lau', 'Erwin T.', ''], dtype=object) array(['Nagai', 'Daisuke', ''], dtype=object) array(['Vikhlinin', 'Alexey', ''], dtype=object)]

2010.03374

Peter Yatsyshin Dr

Peter Yatsyshin, Serafim Kalliadasis and Andrew B. Duncan

Physics-constrained Bayesian inference of state functions in classical density-functional theory

J. Chem. Phys. (2022)

10.1063/5.0071629

cond-mat.stat-mech physics.data-an stat.ML

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We develop a novel data-driven approach to the inverse problem of classical statistical mechanics: given experimental data on the collective motion of a classical many-body system, how does one characterise the free energy landscape of that system? By combining non-parametric Bayesian inference with physically-motivated constraints, we develop an efficient learning algorithm which automates the construction of approximate free energy functionals. In contrast to optimisation-based machine learning approaches, which seek to minimise a cost function, the central idea of the proposed Bayesian inference is to propagate a set of prior assumptions through the model, derived from physical principles. The experimental data is used to probabilistically weigh the possible model predictions. This naturally leads to humanly interpretable algorithms with full uncertainty quantification of predictions. In our case, the output of the learning algorithm is a probability distribution over a family of free energy functionals, consistent with the observed particle data. We find that surprisingly small data samples contain sufficient information for inferring highly accurate analytic expressions of the underlying free energy functionals, making our algorithm highly data efficient. We consider excluded volume particle interactions, which are ubiquitous in nature, whilst being highly challenging for modelling in terms of free energy. To validate our approach we consider the paradigmatic case of one-dimensional fluid and develop inference algorithms for the canonical and grand-canonical statistical-mechanical ensembles. Extensions to higher-dimensional systems are conceptually straightforward, whilst standard coarse-graining techniques allow one to easily incorporate attractive interactions.

[{'version': 'v1', 'created': 'Wed, 7 Oct 2020 12:43:42 GMT'} {'version': 'v2', 'created': 'Mon, 23 Nov 2020 17:50:19 GMT'} {'version': 'v3', 'created': 'Fri, 18 Jun 2021 17:20:40 GMT'} {'version': 'v4', 'created': 'Wed, 23 Jun 2021 10:28:00 GMT'}]

2022-03-01

[array(['Yatsyshin', 'Peter', ''], dtype=object) array(['Kalliadasis', 'Serafim', ''], dtype=object) array(['Duncan', 'Andrew B.', ''], dtype=object)]

astro-ph/0511231

Daniela Kirilova

Daniela P. Kirilova

More General BBN Constraints on Neutrino Oscillations Parameters - Relaxed or Strengthened

13 pages, 4 figures

Int.J.Mod.Phys.D16:1197-1210,2007

10.1142/S0218271807010791

ULB-TH/04-01

astro-ph hep-ph

I discuss BBN with nonequilibrium nu_e<->nu_s oscillations in the more general case of non-zero population of nu_s before oscillations delta N_s>0. I calculate He-4 primordial production Y_p(delta N_s) in the presence of nu_e<->nu_s oscillations for different initial populations of nu_s state 0<=delta N_s<=1 and the full range of oscillation parameters. Non-zero delta N_s has two-fold effect on He-4: (i) it enhances the energy density and hence increases the cosmic expansion rate, leading to Y_p overproduction and (ii) it suppresses the kinetic effects of oscillations on BBN, namely the effects on pre-BBN nucleon kinetics caused by the nu_e energy spectrum distortion and the neutrino-antineutrino asymmetry generation by oscillations, leading to decreased Y_p overproduction. Depending on oscillation parameters one or the other effect may dominate, causing, correspondingly, either a relaxation of the cosmological constraints or their strengthening with the increase of delta N_s . I calculate more general BBN constraints on nu_e<->nu_s oscillation parameters,corresponding to 3% Y_p overproduction, for different initial populations of nu_s.Previous BBN constraints were derived assuming empty sterile state before oscillations. The cosmological constraints for that case strengthen with the increase of delta N_s value.

[{'version': 'v1', 'created': 'Tue, 8 Nov 2005 18:08:49 GMT'}]

2008-11-26

[array(['Kirilova', 'Daniela P.', ''], dtype=object)]

0705.0540

Jon M. Miller

J. M. Miller (University of Michigan)

Relativistic X-ray Lines from the Inner Accretion Disks Around Black Holes

40 pages, includes color figures, to appear in ARAA, vol 45, in press

Ann.Rev.Astron.Astrophys.45:441-479,2007

10.1146/annurev.astro.45.051806.110555

astro-ph

Relativistic X-ray emission lines from the inner accretion disk around black holes are reviewed. Recent observations with the Chandra X-ray Observatory, X-ray Multi-Mirror Mission-Newton, and Suzaku are revealing these lines to be good probes of strong gravitational effects. A number of important observational and theoretical developments are highlighted, including evidence of black hole spin and effects such as gravitational light bending, the detection of relativistic lines in stellar-mass black holes, and evidence of orbital-timescale line flux variability. In addition, the robustness of the relativistic disk lines against absorption, scattering, and continuum effects is discussed. Finally, prospects for improved measures of black hole spin and understanding the spin history of supermassive black holes in the context of black hole-galaxy co-evolution are presented. The best data and most rigorous results strongly suggest that relativistic X-ray disk lines can drive future explorations of General Relativity and disk physics.

[{'version': 'v1', 'created': 'Thu, 3 May 2007 21:00:46 GMT'} {'version': 'v2', 'created': 'Tue, 29 May 2007 18:35:32 GMT'} {'version': 'v3', 'created': 'Wed, 6 Jun 2007 15:33:00 GMT'}]

2009-06-23

[array(['Miller', 'J. M.', '', 'University of Michigan'], dtype=object)]

2104.10419

Xin Huang

Xin Huang, Xinxin Wang, Wenyu Lv, Xiaying Bai, Xiang Long, Kaipeng Deng, Qingqing Dang, Shumin Han, Qiwen Liu, Xiaoguang Hu, Dianhai Yu, Yanjun Ma, Osamu Yoshie

PP-YOLOv2: A Practical Object Detector

cs.CV

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Being effective and efficient is essential to an object detector for practical use. To meet these two concerns, we comprehensively evaluate a collection of existing refinements to improve the performance of PP-YOLO while almost keep the infer time unchanged. This paper will analyze a collection of refinements and empirically evaluate their impact on the final model performance through incremental ablation study. Things we tried that didn't work will also be discussed. By combining multiple effective refinements, we boost PP-YOLO's performance from 45.9% mAP to 49.5% mAP on COCO2017 test-dev. Since a significant margin of performance has been made, we present PP-YOLOv2. In terms of speed, PP-YOLOv2 runs in 68.9FPS at 640x640 input size. Paddle inference engine with TensorRT, FP16-precision, and batch size = 1 further improves PP-YOLOv2's infer speed, which achieves 106.5 FPS. Such a performance surpasses existing object detectors with roughly the same amount of parameters (i.e., YOLOv4-CSP, YOLOv5l). Besides, PP-YOLOv2 with ResNet101 achieves 50.3% mAP on COCO2017 test-dev. Source code is at https://github.com/PaddlePaddle/PaddleDetection.

[{'version': 'v1', 'created': 'Wed, 21 Apr 2021 08:55:37 GMT'}]

2021-04-22

[array(['Huang', 'Xin', ''], dtype=object) array(['Wang', 'Xinxin', ''], dtype=object) array(['Lv', 'Wenyu', ''], dtype=object) array(['Bai', 'Xiaying', ''], dtype=object) array(['Long', 'Xiang', ''], dtype=object) array(['Deng', 'Kaipeng', ''], dtype=object) array(['Dang', 'Qingqing', ''], dtype=object) array(['Han', 'Shumin', ''], dtype=object) array(['Liu', 'Qiwen', ''], dtype=object) array(['Hu', 'Xiaoguang', ''], dtype=object) array(['Yu', 'Dianhai', ''], dtype=object) array(['Ma', 'Yanjun', ''], dtype=object) array(['Yoshie', 'Osamu', ''], dtype=object)]

1602.03310

Sibashisa Dash Dr

Le Wang, Sibashisa Dash, Lei Chang, Lu You, Yaqing Feng, Xu He, Kui-juan Jin, Yang Zhou, Hock Guan Ong, Peng Ren, Shiwei Wang, Lang Chen, and Junling Wang

Oxygen vacancy induced room temperature metal-insulator transition in nickelates films and its potential application in photovoltaics

cond-mat.str-el

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Oxygen vacancy is intrinsically coupled with magnetic, electronic and transport properties of transition-metal oxide materials and directly determines their multifunctionality. Here, we demonstrate reversible control of oxygen content by post-annealing at temperature lower than 300 degree centigrade and realize the reversible metal-insulator transition in epitaxial NdNiO3 films. Importantly, over six orders of magnitude in the resistance modulation and a large change in optical band gap are demonstrated at room temperature without destroying the parent framework and changing the p-type conductive mechanism. Further study revealed that oxygen vacancies stabilized the insulating phase at room temperature is universal for perovskite nickelates films. Acting as electron donors, oxygen vacancies not only stabilize the insulating phase at room temperature, but also induce a large magnetization of ~50 emu/cm3 due to the formation of strongly correlated Ni2+ t2g6eg2 states. The band gap opening is an order of magnitude larger than that of the thermally driven metal-insulator transition and continuously tunable. Potential application of the newly found insulating phase in photovoltaics has been demonstrated in the nickelates-based heterojunctions. Our discovery opens up new possibilities for strongly correlated perovskite nickelates.

[{'version': 'v1', 'created': 'Wed, 10 Feb 2016 09:49:55 GMT'}]

2016-02-11

[array(['Wang', 'Le', ''], dtype=object) array(['Dash', 'Sibashisa', ''], dtype=object) array(['Chang', 'Lei', ''], dtype=object) array(['You', 'Lu', ''], dtype=object) array(['Feng', 'Yaqing', ''], dtype=object) array(['He', 'Xu', ''], dtype=object) array(['Jin', 'Kui-juan', ''], dtype=object) array(['Zhou', 'Yang', ''], dtype=object) array(['Ong', 'Hock Guan', ''], dtype=object) array(['Ren', 'Peng', ''], dtype=object) array(['Wang', 'Shiwei', ''], dtype=object) array(['Chen', 'Lang', ''], dtype=object) array(['Wang', 'Junling', ''], dtype=object)]

1004.2263

Nathan Smith

Nathan Smith, Matthew S. Povich, Barbara A. Whitney, Ed Churchwell, Brian L. Babler, Marilyn R. Meade, John Bally, Robert D. Gehrz, Thomas P. Robitaille, and Keivan G. Stassun

Spitzer Space Telescope observations of the Carina Nebula: The steady march of feedback-driven star formation

25 pages, 15 figures, MNRAS accepted

10.1111/j.1365-2966.2010.16792.x

astro-ph.SR astro-ph.GA

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We report the first results of imaging the Carina Nebula with Spitzer/IRAC, providing a catalog of point sources and YSOs based on SED fits. We discuss several aspects of the extended emission, including dust pillars that result when a clumpy molecular cloud is shredded by massive star feedback. There are few "extended green objects" (EGOs) normally taken as signposts of outflow activity, and none of the HH jets detected optically are seen as EGOs. A population of "extended red objects" tends to be found around OB stars, some with clear bow-shocks. These are dusty shocks where stellar winds collide with flows off nearby clouds. Finally, the relative distributions of O stars and subclusters of YSOs as compared to dust pillars shows that while some YSOs are located within pillars, many more stars and YSOs reside just outside pillar heads. We suggest that pillars are transient phenomena, part of a continuous outwardly propagating wave of star formation driven by massive star feedback. As pillars are destroyed, they leave newly formed stars in their wake, which are then subsumed into the young OB association. Altogether, the current generation of YSOs shows no strong deviation from a normal IMF. The number of YSOs suggests a roughly constant star-formation rate over the past 3Myr, implying that star formation in pillars constitutes an important mechanism to construct unbound OB associations. Accelerated pillars may give birth to O-type stars that, after several Myr, could appear to have formed in isolation.

[{'version': 'v1', 'created': 'Tue, 13 Apr 2010 20:05:52 GMT'}]

2015-05-18

[array(['Smith', 'Nathan', ''], dtype=object) array(['Povich', 'Matthew S.', ''], dtype=object) array(['Whitney', 'Barbara A.', ''], dtype=object) array(['Churchwell', 'Ed', ''], dtype=object) array(['Babler', 'Brian L.', ''], dtype=object) array(['Meade', 'Marilyn R.', ''], dtype=object) array(['Bally', 'John', ''], dtype=object) array(['Gehrz', 'Robert D.', ''], dtype=object) array(['Robitaille', 'Thomas P.', ''], dtype=object) array(['Stassun', 'Keivan G.', ''], dtype=object)]

2204.10624

Yinhong Liu

Yinhong Liu, Guy Emerson

Learning Functional Distributional Semantics with Visual Data

Accepted by ACL 2022 main conference

cs.CL cs.AI

http://creativecommons.org/publicdomain/zero/1.0/

Functional Distributional Semantics is a recently proposed framework for learning distributional semantics that provides linguistic interpretability. It models the meaning of a word as a binary classifier rather than a numerical vector. In this work, we propose a method to train a Functional Distributional Semantics model with grounded visual data. We train it on the Visual Genome dataset, which is closer to the kind of data encountered in human language acquisition than a large text corpus. On four external evaluation datasets, our model outperforms previous work on learning semantics from Visual Genome.

[{'version': 'v1', 'created': 'Fri, 22 Apr 2022 10:41:39 GMT'}]

2022-04-25

[array(['Liu', 'Yinhong', ''], dtype=object) array(['Emerson', 'Guy', ''], dtype=object)]

1002.3760

Parinya Karndumri

Edi Gava, Parinya Karndumri and K.S. Narain

AdS$_3$ vacua and RG flows in three dimensional gauged supergravities

35 pages in JHEP form, 3 figures, typos corrected, references added

JHEP 04 (2010) 117

10.1007/JHEP04(2010)117

hep-th

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We study $AdS_3$ supersymmetric vacua in N=4 and N=8, three dimensional gauged supergravities, with scalar manifolds $(\frac{SO(4,4)}{SO(4)\times SO(4)})^2$ and $\frac{SO(8,8)}{SO(8)\times SO(8)}$, non-semisimple Chern-Simons gaugings $SO(4)\ltimes {\bf R}^6$ and $(SO(4)\ltimes {\bf R}^6)^2$, respectively. These are in turn equivalent to SO(4) and $SO(4)\times SO(4)$ Yang-Mills theories coupled to supergravity. For the N=4 case, we study renormalization group flows between UV and IR $AdS_3$ vacua with the same amount of supersymmetry: in one case, with (3,1) supersymmetry, we can find an analytic solution whereas in another, with (2,0) supersymmetry, we give a numerical solution. In both cases, the flows turn out to be v.e.v. flows, i.e. they are driven by the expectation value of a relevant operator in the dual $SCFT_2$. These provide examples of v.e.v. flows between two $AdS_3$ vacua within a gauged supergravity framework.

[{'version': 'v1', 'created': 'Fri, 19 Feb 2010 15:36:29 GMT'} {'version': 'v2', 'created': 'Mon, 1 Mar 2010 15:20:00 GMT'} {'version': 'v3', 'created': 'Tue, 2 Mar 2010 11:15:24 GMT'} {'version': 'v4', 'created': 'Fri, 5 Mar 2010 16:14:38 GMT'} {'version': 'v5', 'created': 'Wed, 28 Apr 2010 17:36:37 GMT'} {'version': 'v6', 'created': 'Sun, 8 May 2011 15:38:15 GMT'}]

2012-07-30

[array(['Gava', 'Edi', ''], dtype=object) array(['Karndumri', 'Parinya', ''], dtype=object) array(['Narain', 'K. S.', ''], dtype=object)]

hep-th/9807183

Katsushi Ito

Katsushi Ito, Chuan-Sheng Xiong and Sung-Kil Yang

Seiberg-Witten Theory as d<1 Topological Strings

12 pages, latex

Phys.Lett. B441 (1998) 155-162

10.1016/S0370-2693(98)01124-1

YITP-98-44

hep-th

In view of two-dimensional topological gravity coupled to matter, we study the Seiberg-Witten theory for the low-energy behavior of N=2 supersymmetric Yang-Mills theory with ADE gauge groups. We construct a new solution of the Picard-Fuchs equations obeyed by the Seiberg-Witten periods. Our solution is expressed as the linear sum over the infinite set of one-point functions of gravitational descendants in $d<1$ topological strings. It turns out that our solution provides the power series expansion around the origin of the quantum moduli space of the Coulomb branch. For SU(N) gauge group we show how the Seiberg-Witten periods are reconstructed from the present solution.

[{'version': 'v1', 'created': 'Fri, 24 Jul 1998 03:10:30 GMT'}]

2009-10-31

[array(['Ito', 'Katsushi', ''], dtype=object) array(['Xiong', 'Chuan-Sheng', ''], dtype=object) array(['Yang', 'Sung-Kil', ''], dtype=object)]

0809.2205

Christophe Martayan

Christophe Martayan (GEPI), Jean Zorec, Yves Fremat

ZAMS rotational velocities of Be/Oe stars and LGRBs progenitors in the Magellanic Clouds

poster IAUS256

astro-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The Large and Small Magellanic Clouds are priviledged environments to perform tests of theoretical predictions at low metallicity on rotational velocities and stellar evolution. According to theoretical predictions, the rotational velocities of B-type stars are expected to be higher in low metallicity (LMC/SMC) than in high metallicity (MW) environments. To verify the models, we observed with the VLT-FLAMES 523 B and Be stars, which form, at the moment, the largest observed sample of these kind of objects in the MCs. We first determined the stellar fundamental parameters and we found that B and Be stars rotate faster in the MCs than in the MW. We also determined the first distribution of the average ZAMS rotational velocities versus the mass of Be stars. These results indicate that the appearance of Be stars is mass-, metallicity-, stellar evolution-, and star-formation regions-dependant. Moreover, the recent models of Long Gamma Ray Bursts progenitors foresee possible LGRBs progenitors at the SMC's metallicity. We confront these models with the observed (ZAMS rotational velocities, masses) distributions of the fastest rotators (Be and Oe stars) in our sample. Furthermore, we compare the corresponding predicted rates from our study with observed rates of LGRBs.

[{'version': 'v1', 'created': 'Fri, 12 Sep 2008 12:48:11 GMT'}]

2008-09-15

[array(['Martayan', 'Christophe', '', 'GEPI'], dtype=object) array(['Zorec', 'Jean', ''], dtype=object) array(['Fremat', 'Yves', ''], dtype=object)]

1308.3536

Henry Adams

Henry Adams and Gunnar Carlsson

Evasion Paths in Mobile Sensor Networks

International Journal of Robotics Research 34 (2015), 90-104

10.1177/0278364914548051

math.AT cs.RO

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Suppose that ball-shaped sensors wander in a bounded domain. A sensor doesn't know its location but does know when it overlaps a nearby sensor. We say that an evasion path exists in this sensor network if a moving intruder can avoid detection. In "Coordinate-free coverage in sensor networks with controlled boundaries via homology", Vin deSilva and Robert Ghrist give a necessary condition, depending only on the time-varying connectivity data of the sensors, for an evasion path to exist. Using zigzag persistent homology, we provide an equivalent condition that moreover can be computed in a streaming fashion. However, no method with time-varying connectivity data as input can give necessary and sufficient conditions for the existence of an evasion path. Indeed, we show that the existence of an evasion path depends not only on the fibrewise homotopy type of the region covered by sensors but also on its embedding in spacetime. For planar sensors that also measure weak rotation and distance information, we provide necessary and sufficient conditions for the existence of an evasion path.

[{'version': 'v1', 'created': 'Fri, 16 Aug 2013 02:16:09 GMT'} {'version': 'v2', 'created': 'Sun, 15 Sep 2013 22:47:13 GMT'} {'version': 'v3', 'created': 'Fri, 24 Jan 2014 17:19:28 GMT'}]

2016-01-26

[array(['Adams', 'Henry', ''], dtype=object) array(['Carlsson', 'Gunnar', ''], dtype=object)]

1111.3641

Hao Zhang

Edmond L. Berger, Qing-Hong Cao, Chuan-Ren Chen, Jiang-Hao Yu, Hao Zhang

Dynamical Origin of the Correlation between the Asymmetries $A_{FB}^t$ and $A_{FB}^{\ell}$

ANL-HEP-PR-11-74; MSUHEP-111024

hep-ph hep-ex

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

A larger than expected forward-backward asymmetry in rapidity is observed in top quark pairs produced in proton-antiproton collisions at the Tevatron. The asymmetry is seen in both the top quark distribution $A_{FB}^t$ and in the distribution of charged leptons $A_{FB}^\ell$ from top quark decay. In this paper, we study the kinematic and dynamic aspects of the tight relationship of the two observables arising from the spin correlation between the charged lepton and the top quark with different polarization states. We also consider two benchmark new physics models, an axigluon model and a flavor-changing $W^\prime$ model. These models could explain the values of both $A_{FB}^t$ and $A_{FB}^\ell$. We emphasize the value of both measurements, and we conclude that a model which produces more right-handed than left-handed top quarks is favored by the present data.

[{'version': 'v1', 'created': 'Tue, 15 Nov 2011 21:00:16 GMT'}]

2011-11-18

[array(['Berger', 'Edmond L.', ''], dtype=object) array(['Cao', 'Qing-Hong', ''], dtype=object) array(['Chen', 'Chuan-Ren', ''], dtype=object) array(['Yu', 'Jiang-Hao', ''], dtype=object) array(['Zhang', 'Hao', ''], dtype=object)]

1907.06164

Menassie Ephrem

Menassie Ephrem

Primitive Ideals of Labelled Graph $C^*$-algebras

Houston Journal of Math. to appear

math.OA math.FA

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Given a directed graph $E$ and a labeling $\mathcal{L}$, one forms the labelled graph $C^*$-algebra by taking a weakly left--resolving labelled space $(E, \mathcal{L}, \mathcal{B})$ and considering a universal generating family of partial isometries and projections. In this paper we provide characterization for primitive ideals of labelled graph $C^*$-algebras.

[{'version': 'v1', 'created': 'Sun, 14 Jul 2019 04:00:38 GMT'}]

2019-07-16

[array(['Ephrem', 'Menassie', ''], dtype=object)]

1805.02241

Juliao Braga

Juliao Braga and Nizam Omar and Luciana F. Thome

Acquisition and use of knowledge over a restricted domain by intelligent agents

5 pages

10.1145/3077286.3077293

cs.AI cs.MA cs.NI

http://creativecommons.org/licenses/by/4.0/

This short paper provides a description of an architecture to acquisition and use of knowledge by intelligent agents over a restricted domain of the Internet Infrastructure. The proposed architecture is added to an intelligent agent deployment model over a very useful server for Internet Autonomous System administrators. Such servers, which are heavily dependent on arbitrary and eventual updates of human beings, become unreliable. This is a position paper that proposes three research questions that are still in progress.

[{'version': 'v1', 'created': 'Sun, 6 May 2018 16:32:19 GMT'}]

2018-05-08

[array(['Braga', 'Juliao', ''], dtype=object) array(['Omar', 'Nizam', ''], dtype=object) array(['Thome', 'Luciana F.', ''], dtype=object)]

1106.2601

Vikram Dhillon

Vikram Dhillon

Knowledge Dispersion Index for Measuring Intellectual Capital

Submitted to Innocentive

cs.SI q-fin.GN

http://creativecommons.org/licenses/by/3.0/

In this paper we propose a novel index to quantify and measure the flow of information on macro and micro scales. We discuss the implications of this index for knowledge management fields and also as intellectual capital that can thus be utilized by entrepreneurs. We explore different function and human oriented metrics that can be used at micro-scales to process the flow of information. We present a table of about 23 metrics, such as change in IT inventory and percentage of employees with advanced degrees, that can be used at micro scales to wholly quantify knowledge dispersion as intellectual capital. At macro scales we split the economy in an industrial and consumer sector where the flow of information in each determines how fast an economy is going to grow and how overall an economy will perform given the aggregate demand. Lastly, we propose a model for knowledge dispersion based on graph theory and show how corrections in the flow become self-evident. Through the principals of flow conservation and capacity constrains we also speculate how this flow might seeks some equilibrium and exhibit self-correction codes. This proposed model allows us to account for perturbations in form of local noise, evolution of networks, provide robustness against local damage from lower nodes, and help determine the underlying classification into network super-families.

[{'version': 'v1', 'created': 'Tue, 14 Jun 2011 03:02:58 GMT'}]

2011-06-15

[array(['Dhillon', 'Vikram', ''], dtype=object)]

2110.15363

Najme Ebrahimi Dr

Payman Pahlavan and Najme Ebrahimi

Dual-band Harmonic and Subharmonic Frequency Generation Circuitry for Joint Communication and Localization Applications Under Severe Multipath Environment

eess.SP cs.SY eess.SY

http://creativecommons.org/licenses/by/4.0/

The next generation of ultra-dense connected and automated wireless sensor networks (WSN) requires proximity intelligence for many of its applications, especially for identification and localization. This work presents the first bidirectional circuitry for Internet of Things (IoT) transponder that reciprocally generates harmonics and subharmonics, dual-band frequencies. A multi-band or wideband localization system is essential for future intelligent WSN to mitigate the influence of multipath signals for indoor dense environment. The proposed frequency generation circuitry is based on the novel nonlinear ring resonator (NRR) operating based on standing wave resonation. The proposed NRR generates two sustainable oscillation frequencies based on the periodicity of the nonlinear circuit in the ring configuration. Due to the symmetry and reciprocity of the ring layout, the two bidirectional ports can excite the circuit at the two opposite nodes while maintaining the required boundary conditions for oscillation. The sustainable resonance conditions occur by creating zero, short impedance, or pole, infinite impedance, at subharmonic and harmonic excitation ports. The NRR circuit consumes zero DC power and covers two communication frequency plans interchangeably, which makes it a premier technique compared to the conventional ultra-wideband (UWB) localization system and conventional single-band nonlinear passive circuitry. The latter is narrowband due to the tunning limitation of the nonlinear varactor while the former is power-hungry approach with complex hardware requirements.

[{'version': 'v1', 'created': 'Fri, 29 Oct 2021 06:44:20 GMT'}]

2021-11-01

[array(['Pahlavan', 'Payman', ''], dtype=object) array(['Ebrahimi', 'Najme', ''], dtype=object)]

1312.4114

Egor Ianovski

Egor Ianovski, Luke Ong

EGuaranteeNash for Boolean Games is NEXP-Hard

cs.GT

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Boolean games are an expressive and natural formalism through which to investigate problems of strategic interaction in multiagent systems. Although they have been widely studied, almost all previous work on Nash equilibria in Boolean games has focused on the restricted setting of pure strategies. This is a shortcoming as finite games are guaranteed to have at least one equilibrium in mixed strategies, but many simple games fail to have pure strategy equilibria at all. We address this by showing that a natural decision problem about mixed equilibria: determining whether a Boolean game has a mixed strategy equilibrium that guarantees every player a given payoff, is NEXP-hard. Accordingly, the $\epsilon$ variety of the problem is NEXP-complete. The proof can be adapted to show coNEXP-hardness of a similar question: whether all Nash equilibria of a Boolean game guarantee every player at least the given payoff.

[{'version': 'v1', 'created': 'Sun, 15 Dec 2013 06:36:40 GMT'}]

2013-12-17

[array(['Ianovski', 'Egor', ''], dtype=object) array(['Ong', 'Luke', ''], dtype=object)]

astro-ph/0208449

Groenewegen

M.A.T. Groenewegen

Carbon stars in the Local Group

Unofficial proceedings of an invited talk at the Ringberg conference on "The Chemical Evolution of Dwarf Galaxies". Slides are available at http://www.ster.kuleuven.ac.be/~groen/presentation.html

astro-ph

The current status of carbon stars in the Local Group and beyond, is discussed. Although many carbon stars and late M-stars have been identified in Local Group galaxies, a coherent understanding in terms of the chemical evolution- and star formation history of a galaxy is still largely lacking. Although a few major new surveys have been carried out over the last three years, the observational data is still incomplete in many respects: 1) for some of the larger galaxies only a small fraction in area has been surveyed so far, 2) surveys have been conducted using different techniques, and some of the older surveys are incomplete in bolometric magnitude, 3) only for some galaxies is there information about the late M-star population, or it is sometimes unpublished even when the data is available, 4) not all galaxies in the Local Group have been surveyed, 5) especially for some of the older work insufficient data is available to determine bolometric magnitudes. I have correlated carbon star positions with the 2MASS 2nd incremental data release to obtain $JHK$, and bolometric magnitudes, to remedy this situation in some cases. From the existing observations one can derive the following: the formation of carbon stars is both a function of metallicity and star-formation history. In galaxies with a similar star formation history, there will be relatively more carbon stars formed in the system with the lower metallicity. On the other hand, the scarcity of AGB type carbon stars in some galaxies with the lowest metallicity indicates that these systems have had a low, if any, star-formation over the last few Gyrs.

[{'version': 'v1', 'created': 'Sat, 24 Aug 2002 11:50:39 GMT'}]

2007-05-23

[array(['Groenewegen', 'M. A. T.', ''], dtype=object)]

hep-ex/9811021

Brunner

ALEPH collaboration

Study of D0-Dbar0 mixing and D0 doubly cabibbo-suppressed decays

14 pages, 5 figures

Phys.Lett.B436:211-221,1998

10.1016/S0370-2693(98)00946-0

CERN-EP/98-118

hep-ex

Using a sample of four million hadronic Z events collected in ALEPH from 1991 to 1995, the decays D*+ -> D0pi^+_s, with D0 decaying to K-pi+ or to K+pi-, are studied. The relative branching ratio B(D0 -> K+pi-)/B(D0 -> K-pi+) is measured to be (1.84+-0.59(stat.)+-0.34(syst.))%. The two possible contributions to the D0 -> K+pi- decay, doubly cabibbo-suppressed decays and D0-Dbar0 mixing, are disentangled by measuring the proper-time ditribution of the reconstructed D0's. Assuming no interference between the two processes, the upper limit obtained on the mixing rate is 0.92% at 95% CL. The possible effect of interference between the two amplitudes is also assessed.

[{'version': 'v1', 'created': 'Wed, 11 Nov 1998 13:14:37 GMT'}]

2012-08-27

[array(['ALEPH collaboration', '', ''], dtype=object)]

1703.09139

Tomoaki Matsumoto

Tomoaki Matsumoto, Masahiro N. Machida, and Shu-ichiro Inutsuka

Circumstellar disks and outflows in turbulent molecular cloud cores: possible formation mechanism for misaligned systems

14 pages, 15 figures, Accepted by ApJ

10.3847/1538-4357/aa6a1c

astro-ph.SR astro-ph.GA

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We investigate the formation of circumstellar disks and outflows subsequent to the collapse of molecular cloud cores with the magnetic field and turbulence. Numerical simulations are performed by using an adaptive mesh refinement to follow the evolution up to $\sim 1000$~yr after the formation of a protostar. In the simulations, circumstellar disks are formed around the protostars; those in magnetized models are considerably smaller than those in nonmagnetized models, but their size increases with time. The models with stronger magnetic field tends to produce smaller disks. During evolution in the magnetized models, the mass ratios of a disk to a protostar is approximately constant at $\sim 1-10$\%. The circumstellar disks are aligned according to their angular momentum, and the outflows accelerate along the magnetic field on the $10-100$~au scale; this produces a disk that is misaligned with the outflow. The outflows are classified into two types: a magneto-centrifugal wind and a spiral flow. In the latter, because of the geometry, the axis of rotation is misaligned with the magnetic field. The magnetic field has an internal structure in the cloud cores, which also causes misalignment between the outflows and the magnetic field on the scale of the cloud core. The distribution of the angular momentum vectors in a core also has a non-monotonic internal structure. This should create a time-dependent accretion of angular momenta onto the circumstellar disk. Therefore, the circumstellar disks are expected to change their orientation as well as their sizes in the long-term evolutions.

[{'version': 'v1', 'created': 'Mon, 27 Mar 2017 15:15:29 GMT'} {'version': 'v2', 'created': 'Fri, 7 Apr 2017 18:18:35 GMT'}]

2017-04-26

[array(['Matsumoto', 'Tomoaki', ''], dtype=object) array(['Machida', 'Masahiro N.', ''], dtype=object) array(['Inutsuka', 'Shu-ichiro', ''], dtype=object)]

hep-th/0211227

Dmitri Ryzhikh

L. V. Laperashvili (ITEP, Moscow, Russia)

Generalized Duality Symmetry of Non-Abelian Theories

11 pages

hep-th

The quantum Yang-Mills theory describing dual ($\tilde g$) and non-dual ($g$) charges and revealing the generalized duality symmetry was developed by analogy with the Zwanziger formalism in QED.

[{'version': 'v1', 'created': 'Sat, 23 Nov 2002 17:36:38 GMT'} {'version': 'v2', 'created': 'Thu, 26 Dec 2002 17:28:14 GMT'} {'version': 'v3', 'created': 'Fri, 27 Dec 2002 15:40:21 GMT'}]

2007-05-23

[array(['Laperashvili', 'L. V.', '', 'ITEP, Moscow, Russia'], dtype=object)]

2006.04666

Nayeon Lee

Nayeon Lee, Yejin Bang, Andrea Madotto, Pascale Fung

Misinformation Has High Perplexity

cs.CL cs.AI cs.LG

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Debunking misinformation is an important and time-critical task as there could be adverse consequences when misinformation is not quashed promptly. However, the usual supervised approach to debunking via misinformation classification requires human-annotated data and is not suited to the fast time-frame of newly emerging events such as the COVID-19 outbreak. In this paper, we postulate that misinformation itself has higher perplexity compared to truthful statements, and propose to leverage the perplexity to debunk false claims in an unsupervised manner. First, we extract reliable evidence from scientific and news sources according to sentence similarity to the claims. Second, we prime a language model with the extracted evidence and finally evaluate the correctness of given claims based on the perplexity scores at debunking time. We construct two new COVID-19-related test sets, one is scientific, and another is political in content, and empirically verify that our system performs favorably compared to existing systems. We are releasing these datasets publicly to encourage more research in debunking misinformation on COVID-19 and other topics.

[{'version': 'v1', 'created': 'Mon, 8 Jun 2020 15:13:44 GMT'} {'version': 'v2', 'created': 'Wed, 10 Jun 2020 08:49:30 GMT'}]

2020-06-11

[array(['Lee', 'Nayeon', ''], dtype=object) array(['Bang', 'Yejin', ''], dtype=object) array(['Madotto', 'Andrea', ''], dtype=object) array(['Fung', 'Pascale', ''], dtype=object)]

1702.08399

Alex Samoletov

A. Samoletov and B. Vasiev

Dynamic principle for ensemble control tools

10.1063/1.4993976

physics.data-an

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Dynamical equations describing physical systems at statistical equilibrium are commonly extended by mathematical tools called "thermostats". These tools are designed for sampling ensembles of statistical mechanics. We propose a dynamic principle for derivation of stochastic and deterministic thermostats. It is based on fundamental physical assumptions such that the canonical measure is invariant for the thermostat dynamics. This is a clear advantage over a range of recently proposed and widely discussed in the literature mathematical thermostat schemes. Following justification of the proposed principle we show its generality and usefulness for modeling a wide range of natural systems.

[{'version': 'v1', 'created': 'Mon, 27 Feb 2017 17:47:40 GMT'} {'version': 'v2', 'created': 'Wed, 5 Jul 2017 06:15:14 GMT'} {'version': 'v3', 'created': 'Sun, 15 Oct 2017 14:04:19 GMT'}]

2018-01-17

[array(['Samoletov', 'A.', ''], dtype=object) array(['Vasiev', 'B.', ''], dtype=object)]

2206.03769

Adam Rancon

I. Balog, A. Ran\c{c}on, B. Delamotte

Critical probability distributions of the order parameter from the functional renormalization group

5+5 pages, 3+5 figures. Changed title compared to v1. Corresponds to published version, some typos corrected

Phys. Rev. Lett. 129, 210602 (2022)

10.1103/PhysRevLett.129.210602

cond-mat.stat-mech hep-th

http://creativecommons.org/licenses/by/4.0/

We show that the functional renormalization group (FRG) allows for the calculation of the probability distribution function of the sum of strongly correlated random variables. On the example of the three-dimensional Ising model at criticality and using the simplest implementation of the FRG, we compute the probability distribution functions of the order parameter or equivalently its logarithm, called the rate functions in large deviations theory. We compute the entire family of universal scaling functions, obtained in the limit where the system size $L$ and the correlation length of the infinite system $\xi_{\infty}$ diverge, with the ratio $\zeta=L/\xi_{\infty}$ held fixed. It compares very accurately with numerical simulations.

[{'version': 'v1', 'created': 'Wed, 8 Jun 2022 09:31:39 GMT'} {'version': 'v2', 'created': 'Tue, 10 Jan 2023 09:02:19 GMT'}]

2023-01-11

[array(['Balog', 'I.', ''], dtype=object) array(['Rançon', 'A.', ''], dtype=object) array(['Delamotte', 'B.', ''], dtype=object)]

2306.08305

Yongchun Xu

Yongchun Xu, Jie Yang, Zengtao Kuang, Qun Huang, Wei Huang, Heng Hu

Quantum Computing Enhanced Distance-Minimizing Data-Driven Computational Mechanics

22 pages, 14 figures

cs.CE

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The distance-minimizing data-driven computational mechanics has great potential in engineering applications by eliminating material modeling error and uncertainty. In this computational framework, the solution-seeking procedure relies on minimizing the distance between the constitutive database and the conservation law. However, the distance calculation is time-consuming and often takes up most of the computational time in the case of a huge database. In this paper, we show how to use quantum computing to enhance data-driven computational mechanics by exponentially reducing the computational complexity of distance calculation. The proposed method is not only validated on the quantum computer simulator Qiskit, but also on the real quantum computer from OriginQ. We believe that this work represents a promising step towards integrating quantum computing into data-driven computational mechanics.

[{'version': 'v1', 'created': 'Wed, 14 Jun 2023 07:22:52 GMT'}]

2023-06-21

[array(['Xu', 'Yongchun', ''], dtype=object) array(['Yang', 'Jie', ''], dtype=object) array(['Kuang', 'Zengtao', ''], dtype=object) array(['Huang', 'Qun', ''], dtype=object) array(['Huang', 'Wei', ''], dtype=object) array(['Hu', 'Heng', ''], dtype=object)]

hep-ph/0001269

Giuseppe Degrassi

G D'Agostini and G. Degrassi

Constraining the Higgs boson mass through the combination of direct search and precision measurement results

Contributed paper to the workshop on Confidence Limit, CERN, Geneva Jan. 17-18, 2000. 12 pages, 2 figures

hep-ph

We show that the likelihood ratio of Higgs search experiments is a form to report the experimental results suitable to be combined with the information from precision measurements to obtain a joint constraint on the Higgs mass. We update our previous combined analysis using the new results on direct searches and recent precision measurements, including also the Z0 leptonic partial width result. The method is also improved to take into account small non linearity effects in the theoretical formulae. We find an expected value for the Higgs mass around 160-170 GeV with an expectation uncertainty, quantified by the standard deviation of the distribution, of about 50-60 GeV. The 95% probability upper limit comes out to be around 260-290 GeV.

[{'version': 'v1', 'created': 'Wed, 26 Jan 2000 13:43:05 GMT'}]

2007-05-23

[array(["D'Agostini", 'G', ''], dtype=object) array(['Degrassi', 'G.', ''], dtype=object)]

2201.00495

Oleg Kiselyov

Oleg Kiselyov (Tohoku University, Japan) and Jeremy Yallop (University of Cambridge, UK)

let (rec) insertion without Effects, Lights or Magic

Peer-reviewed and accepted for presentation as a short paper at PEPM 2022

cs.PL cs.SC

http://creativecommons.org/licenses/by/4.0/

Let insertion in program generation is producing code with definitions (let-statements). Although definitions precede uses in generated code, during code generation `uses' come first: we might not even know a definition is needed until we encounter a reoccurring expression. Definitions are thus generated `in hindsight', which explains why this process is difficult to understand and implement -- even more so for parameterized, recursive and mutually recursive definitions. We have earlier presented an interface for let(rec) insertion -- i.e. for generating (mutually recursive) definitions. We demonstrated its expressiveness and applications, but not its implementation, which relied on effects and compiler magic. We now show how one can understand let insertion, and hence implement it in plain OCaml. We give the first denotational semantics of let(rec)-insertion, which does not rely on any effects at all. The formalization has guided the implementation of let(rec) insertion in the current version of MetaOCaml.

[{'version': 'v1', 'created': 'Mon, 3 Jan 2022 06:32:39 GMT'}]

2022-01-04

[array(['Kiselyov', 'Oleg', '', 'Tohoku University, Japan'], dtype=object) array(['Yallop', 'Jeremy', '', 'University\n of Cambridge, UK'], dtype=object) ]

2007.12027

M H Mortad Ph.D.

Mohammed Hichem Mortad

Unbounded operators: (square) roots, nilpotence, closability and some related invertibility results

34 pages

math.FA math.OA

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In this paper, we are mainly concerned with studying arbitrary unbounded square roots of linear operators as well as some of their basic properties. The paper contains many examples and counterexamples. As an illustration, we give explicit everywhere defined unbounded non-closable $nth$ roots of the identity operator as well as the zero operator. We also show a non-closable unbounded operator without any non-closable square root. Among other consequences, we have a way of finding everywhere defined bijective operators, everywhere defined operators which are surjective without being injective and everywhere defined operators which are injective without being surjective. Some related results on nilpotence are also given.

[{'version': 'v1', 'created': 'Thu, 23 Jul 2020 14:11:55 GMT'} {'version': 'v2', 'created': 'Mon, 27 Jul 2020 08:13:21 GMT'}]

2020-07-28

[array(['Mortad', 'Mohammed Hichem', ''], dtype=object)]

1206.4907

Francesco Knechtli

Nikos Irges, Francesco Knechtli and Kyoko Yoneyama

Mean-Field Gauge Interactions in Five Dimensions II. The Orbifold

33 pages, 8 figures; text improved; references corrected; version accepted for publication in Nucl. Phys. B

10.1016/j.nuclphysb.2012.08.011

WUB/12-14

hep-lat

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We study Gauge-Higgs Unification in five dimensions on the lattice by means of the mean-field expansion. We formulate it for the case of an SU(2) pure gauge theory and orbifold boundary conditions along the extra dimension, which explicitly break the gauge symmetry to U(1) on the boundaries. Our main result is that the gauge boson mass computed from the static potential along four-dimensional hyperplanes is nonzero implying spontaneous symmetry breaking. This observation supports earlier data from Monte Carlo simulations [12].

[{'version': 'v1', 'created': 'Thu, 21 Jun 2012 15:06:28 GMT'} {'version': 'v2', 'created': 'Wed, 15 Aug 2012 11:20:51 GMT'} {'version': 'v3', 'created': 'Mon, 20 Aug 2012 10:08:13 GMT'}]

2015-06-05

[array(['Irges', 'Nikos', ''], dtype=object) array(['Knechtli', 'Francesco', ''], dtype=object) array(['Yoneyama', 'Kyoko', ''], dtype=object)]