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hep-th/9502025

Fernando Falceto Blecua

M. Asorey and F. Falceto

Consistency of the Regularization of Gauge Theories by High Covariant Derivatives

20 pages, latex, 3 Postscript figures (expanded version)

Phys.Rev. D54 (1996) 5290-5301

10.1103/PhysRevD.54.5290

hep-th hep-ph

We show that regularization of gauge theories by higher covariant derivatives and gauge invariant Pauli-Villars regulators is a consistent method if the Pauli-Villars vector fields are considered in a covariant in the regulating Pauli-Villars fields is pathological and the original Slavnov proposal in covariant Landau gauge is not correct because of the appearance of massless modes in the regulators which do not decouple when the ultraviolet regulator is removed. In such a case the method does not correspond to the regularization of a pure gauge theory but that of a gauge theory in interaction with massless ghost fields. This explains the problems pointed out by Martin and Ruiz in covariant Landau gauge. However, a minor modification of Slavnov method provides a consistent regularization even for such a case. The regularization that we introduce also solves the problem of overlapping divergences in a way similar to geometric regularization and yields the standard values of the $\beta$ and $\gamma$ functions of the renormalization group equations.

[{'version': 'v1', 'created': 'Fri, 3 Feb 1995 15:58:43 GMT'} {'version': 'v2', 'created': 'Tue, 29 Oct 1996 19:53:10 GMT'}]

2009-10-28

[array(['Asorey', 'M.', ''], dtype=object) array(['Falceto', 'F.', ''], dtype=object)]

1404.2843

Anil Aswani

Anil Aswani, Patrick Bouffard, Xiaojing Zhang, Claire Tomlin

Practical Comparison of Optimization Algorithms for Learning-Based MPC with Linear Models

math.OC cs.RO

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

Learning-based control methods are an attractive approach for addressing performance and efficiency challenges in robotics and automation systems. One such technique that has found application in these domains is learning-based model predictive control (LBMPC). An important novelty of LBMPC lies in the fact that its robustness and stability properties are independent of the type of online learning used. This allows the use of advanced statistical or machine learning methods to provide the adaptation for the controller. This paper is concerned with providing practical comparisons of different optimization algorithms for implementing the LBMPC method, for the special case where the dynamic model of the system is linear and the online learning provides linear updates to the dynamic model. For comparison purposes, we have implemented a primal-dual infeasible start interior point method that exploits the sparsity structure of LBMPC. Our open source implementation (called LBmpcIPM) is available through a BSD license and is provided freely to enable the rapid implementation of LBMPC on other platforms. This solver is compared to the dense active set solvers LSSOL and qpOASES using a quadrotor helicopter platform. Two scenarios are considered: The first is a simulation comparing hovering control for the quadrotor, and the second is on-board control experiments of dynamic quadrotor flight. Though the LBmpcIPM method has better asymptotic computational complexity than LSSOL and qpOASES, we find that for certain integrated systems (like our quadrotor testbed) these methods can outperform LBmpcIPM. This suggests that actual benchmarks should be used when choosing which algorithm is used to implement LBMPC on practical systems.

[{'version': 'v1', 'created': 'Thu, 10 Apr 2014 15:12:20 GMT'}]

2014-04-11

[array(['Aswani', 'Anil', ''], dtype=object) array(['Bouffard', 'Patrick', ''], dtype=object) array(['Zhang', 'Xiaojing', ''], dtype=object) array(['Tomlin', 'Claire', ''], dtype=object)]

math/0502005

Taekyun Kim

Taekyun Kim

A New approach to q-zeta function

6pages

math.NT

We construct the new q-extension of Bernoulli numbers and polynomials in this paper. Finally we consider the q-zeta functions which interpolate the new q-extension of Bernoulli numbers and polynomials.

[{'version': 'v1', 'created': 'Tue, 1 Feb 2005 02:18:36 GMT'}]

2007-05-23

[array(['Kim', 'Taekyun', ''], dtype=object)]

1602.05017

Woosung Park

Woosung Park, Aaron Park, and Su Houng Lee

Dibaryons with two strange quarks and total spin zero in a constituent quark model

22pages, 2figures

Phys. Rev. D 93, 074007 (2016)

10.1103/PhysRevD.93.074007

hep-ph nucl-th

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

We investigate the symmetry property and construct the wave function of the dibaryon states containing two strange quarks with S=0 in both the flavor SU(3) symmetric and breaking cases. We discuss how the color $\otimes$ isospin $\otimes$ spin states of dibaryon in the symmetry broking case of flavor SU(3) can be extracted from the fully antisymmetric states in flavor SU(3). The stability of the dibaryon against the strong decay into two baryons are then discussed, by using the variational method within a constituent quark model with a confining and color-spin interactions. To compare our results with that from lattice QCD in flavor SU(3) limit, we search for the stable H-dibaryon in a wide range of $\pi$ meson mass. We find that with the given potential, there is no compact six quark dibaryon state in the SU(3) flavor symmetry broken case with realistic quark masses as well as in flavor SU(3) symmetric case in a wide range of quark masses.

[{'version': 'v1', 'created': 'Tue, 16 Feb 2016 13:41:34 GMT'}]

2016-04-13

[array(['Park', 'Woosung', ''], dtype=object) array(['Park', 'Aaron', ''], dtype=object) array(['Lee', 'Su Houng', ''], dtype=object)]

1808.00282

Davide Modesti

Davide Modesti and Sergio Pirozzoli and Francesco Grasso

Direct numerical simulation of developed compressible flow in square ducts

physics.flu-dyn

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

We carry out direct numerical simulation of compressible square duct flow in the range of bulk Mach numbers M_b = 0.2-3, and up to friction Reynolds number Re_{\tau} = 500. The effects of flow compressibility on the secondary motions are found to be negligible, as the typical Mach number associated with the cross-stream flow is always less than 0.1. As in the incompressible case, we find that the wall law for the mean streamwise velocity applies with good approximation with respect to the nearest wall, upon suitable compressibility transformation. The same conclusion also applies to a passive scalar field, whereas the mean temperature does not exhibit inertial layers because of nonuniformity of the aerodynamic heating. We further find that the same temperature/velocity relation that holds for planar channels is applicable with good approximation for square ducts, and develop a similar relation between temperature and passive scalars.

[{'version': 'v1', 'created': 'Wed, 1 Aug 2018 11:57:05 GMT'} {'version': 'v2', 'created': 'Mon, 6 Aug 2018 06:47:13 GMT'}]

2018-08-07

[array(['Modesti', 'Davide', ''], dtype=object) array(['Pirozzoli', 'Sergio', ''], dtype=object) array(['Grasso', 'Francesco', ''], dtype=object)]

2008.06369

Xuesong Cai

Xuesong Cai and Istv\'an Kov\'acs and Jeroen Wigard and Preben Mogensen

A Centralized and Scalable Uplink Power Control Algorithm in Low SINR Scenarios

Accepted by IEEE Transactions on Vehicular Technology

10.1109/TVT.2021.3097773

eess.SP

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

Power control is becoming increasingly essential for the fifth-generation (5G) and beyond systems. An example use-case, among others, is the unmanned-aerial-vehicle (UAV) communications where the nearly line-of-sight (LoS) radio channels may result in very low signal-to-interference-plus-noise ratios (SINRs). Investigations in [1] proposed to efficiently and reliably solve this kind of non-convex problem via a series of geometrical programmings (GPs) using condensation approximation. However, it is only applicable for a small-scale network with several communication pairs and practically infeasible with more (e.g. tens of) nodes to be jointly optimized. We therefore in this paper aim to provide new insights into this problem. By properly introducing auxiliary variables, the problem is transformed to an equivalent form which is simpler and more intuitive for condensation. A novel condensation method with linear complexity is also proposed based on the form. The enhancements make the GP-based power control feasible for both small-and especially large-scale networks that are common in 5G and beyond. The algorithm is verified via simulations. A preliminary case study of uplink UAV communications also shows the potential of the algorithm.

[{'version': 'v1', 'created': 'Fri, 14 Aug 2020 13:41:45 GMT'} {'version': 'v2', 'created': 'Wed, 14 Jul 2021 07:23:19 GMT'}]

2021-07-27

[array(['Cai', 'Xuesong', ''], dtype=object) array(['Kovács', 'István', ''], dtype=object) array(['Wigard', 'Jeroen', ''], dtype=object) array(['Mogensen', 'Preben', ''], dtype=object)]

1702.06860

Ivan Izmestiev

Ivan Izmestiev

Spherical and hyperbolic conics

50 pages, 37 figures

math.MG

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

This is a survey of metric properties of non-Euclidean conics, mainly based on works of Chasles and Story. A spherical conic is the intersection of the sphere with a quadratic cone; similarly, a hyperbolic conic is the intersection of the Beltrami-Cayley-Klein disk with an affine conic. Non-Euclidean conics have metric properties similar to those of Euclidean conics, and even more due to the polarity that works here better than in the Euclidean plane.

[{'version': 'v1', 'created': 'Wed, 22 Feb 2017 15:40:24 GMT'}]

2017-02-23

[array(['Izmestiev', 'Ivan', ''], dtype=object)]

astro-ph/0008135

Jounghun Lee

Jounghun Lee (ASIAA), Ue-Li Pen (CITA)

Galaxy Spin Statistics and Spin-Density Correlation

Accepted version, ApJ in press, remaining mistakes and typos correctedd, LaTex file, 41 pages, 3 eps figures

Astrophys.J.555:106-124,2001

10.1086/321472

astro-ph

We present a theoretical study of galaxy spin correlation statistics, with detailed technical derivations. We also find an expression for the spin-density cross-correlation, and apply that to the Tully galaxy catalog. The observational results appear qualitatively consistent with the theoretical predictions, yet the error bars are still large. However, we expect that currently ongoing large surveys such as the Sloan Digital Sky survey (SDSS) will enable us to make a precision measurement of these correlation statistics in the near future. These intrinsic galaxy alignments are expected to dominate over the weak lensing signal in SDSS, and we present the detailed algorithms for the density reconstruction for this case. These observables are tracers of the galaxy-gravity interaction, which may provide us deeper insights into the galaxy formation and large scale matter distribution as well.

[{'version': 'v1', 'created': 'Wed, 9 Aug 2000 09:26:58 GMT'} {'version': 'v2', 'created': 'Tue, 5 Dec 2000 17:15:14 GMT'} {'version': 'v3', 'created': 'Sun, 11 Feb 2001 15:51:42 GMT'}]

2009-07-28

[array(['Lee', 'Jounghun', '', 'ASIAA'], dtype=object) array(['Pen', 'Ue-Li', '', 'CITA'], dtype=object)]

2108.07259

Erdem B{\i}y{\i}k

Erdem B{\i}y{\i}k, Aditi Talati, Dorsa Sadigh

APReL: A Library for Active Preference-based Reward Learning Algorithms

5 pages, 1 figures. Library is available at: https://github.com/Stanford-ILIAD/APReL

AIHRI/2021/47

cs.LG cs.AI cs.RO

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

Reward learning is a fundamental problem in human-robot interaction to have robots that operate in alignment with what their human user wants. Many preference-based learning algorithms and active querying techniques have been proposed as a solution to this problem. In this paper, we present APReL, a library for active preference-based reward learning algorithms, which enable researchers and practitioners to experiment with the existing techniques and easily develop their own algorithms for various modules of the problem. APReL is available at https://github.com/Stanford-ILIAD/APReL.

[{'version': 'v1', 'created': 'Mon, 16 Aug 2021 17:55:23 GMT'} {'version': 'v2', 'created': 'Tue, 4 Jan 2022 10:38:04 GMT'}]

2022-01-05

[array(['Bıyık', 'Erdem', ''], dtype=object) array(['Talati', 'Aditi', ''], dtype=object) array(['Sadigh', 'Dorsa', ''], dtype=object)]

1805.11377

Volodymyr Denysiuk

Volodymyr Denysiuk

The method of summation of divergent trigonometric series

math.CA

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

The generalized summation of divergent trigonometric series, namely by method of $\sigma_k(r,a)$-factors is considered in this paper. It is proved that such summation of Fourier series of periodical function $f(t)$ results in the convolution of this function with kernels $De(r,\alpha,t)$; if the parameter $r$ is integer, these kernels are polynomial normalized basic $B$-splines of order $r-1$ $(r=1,2,\ldots)$. Also it is proved that the method of summation with $\sigma_k(r,a)$-factors is $F$-effective.

[{'version': 'v1', 'created': 'Tue, 29 May 2018 12:09:15 GMT'}]

2018-05-30

[array(['Denysiuk', 'Volodymyr', ''], dtype=object)]

hep-th/9901132

Fernando T. Brandt

F. T. Brandt and J. Frenkel

General structure of the graviton self-energy

4 pages, minor corrections of typos

Phys. Rev. D 59, 127701 (1999)

10.1103/PhysRevD.59.127701

hep-th gr-qc hep-ph

The graviton self-energy at finite temperature depends on fourteen structure functions. We show that, in the absence of tadpoles, the gauge invariance of the effective action imposes three non-linear relations among these functions. The consequences of such constraints, which must be satisfied by the thermal graviton self-energy to all orders, are explicitly verified in general linear gauges to one loop order.

[{'version': 'v1', 'created': 'Tue, 26 Jan 1999 13:43:00 GMT'} {'version': 'v2', 'created': 'Thu, 11 Feb 1999 13:28:29 GMT'}]

2016-08-25

[array(['Brandt', 'F. T.', ''], dtype=object) array(['Frenkel', 'J.', ''], dtype=object)]

1302.1115

Sahar Alipour

S. Alipour, M. Mehboudi, and A. T. Rezakhani

Quantum Metrology in Open Systems: Dissipative Cram\'{e}r-Rao Bound

5 pages, 3 figures, Supplemental Material (10 pages); close to the published version

Phys. Rev. Lett. 112, 120405 (2014)

10.1103/PhysRevLett.112.120405

quant-ph

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

Estimation of parameters is a pivotal task throughout science and technology. Quantum Cram\'{e}r-Rao bound provides a fundamental limit of precision allowed to achieve under quantum theory. For closed quantum systems, it has been shown how the estimation precision depends on the underlying dynamics. Here, we propose a general formulation for metrology scenarios in open quantum systems, aiming to relate the precision more directly to properties of the underlying dynamics. This feature may be employed to enhance an estimation precision, e.g., by quantum control techniques. Specifically, we derive a Cram\'{e}r-Rao bound for a fairly large class of open system dynamics, which is governed by a (time-dependent) dynamical semi-group map. We illustrate the utility of this scenario through three examples.

[{'version': 'v1', 'created': 'Tue, 5 Feb 2013 16:55:12 GMT'} {'version': 'v2', 'created': 'Fri, 26 Jul 2013 13:53:19 GMT'} {'version': 'v3', 'created': 'Mon, 31 Mar 2014 14:02:31 GMT'}]

2014-04-01

[array(['Alipour', 'S.', ''], dtype=object) array(['Mehboudi', 'M.', ''], dtype=object) array(['Rezakhani', 'A. T.', ''], dtype=object)]

1003.4903

Magali Mercier

Magali Mercier (ICJ)

Global smooth solutions of Euler equations for Van der Waals gases

math.AP

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

We prove global in time existence of solutions of the Euler compressible equations for a Van der Waals gas when the density is small enough in $\H{m}$, for $m$ large enough. To do so, we introduce a specific symmetrisation allowing areas of null density. Next, we make estimates in $\H{m}$, using for some terms the estimates done by M. Grassin, who proved the same theorem in the easier case of a perfect polytropic gas. We treat the remaining terms separately, due to their non-linearity.

[{'version': 'v1', 'created': 'Thu, 25 Mar 2010 14:18:18 GMT'}]

2010-04-08

[array(['Mercier', 'Magali', '', 'ICJ'], dtype=object)]

0802.4025

Juan Carlos Muzzio

Juan C. Muzzio

Regular and chaotic motion in elliptical galaxies

12 pages, 2 figures (both are mosaics of 6 and 4 individual figures, respectively, in eps format). It is an invited talk delivered at the workshop "Chaos in Astronomy 2007", in memory of N. Voglis, held in Athens (Greece), 17 - 20 September 2008, and accepted for publication in the Proccedings of that workshop

10.1007/978-3-540-75826-6_19

astro-ph

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

Here I review recent work, by other authors and by myself, on some particular topics related to the regular and chaotic motion in elliptical galaxies. I show that it is quite possible to build highly stable triaxial stellar systems that include large fractions of chaotic orbits and that partially and fully chaotic orbits fill different regions of space, so that it is important not to group them together under the single denomination of chaotic orbits. Partially chaotic orbits should not be confused with weakly fully chaotic orbits either, and their spatial distributions are also different. Slow figure rotation (i.e., rotation in systems with zero angular momentum) seems to be always present in highly flattened models that result from cold collapses, with the rotational velocity diminishing or becoming negligibly small for less flattened models. Finally, I comment on the usefulness and limitation of the classification of regular orbits via frequency analysis.

[{'version': 'v1', 'created': 'Wed, 27 Feb 2008 14:05:12 GMT'}]

2015-05-13

[array(['Muzzio', 'Juan C.', ''], dtype=object)]

1506.04251

Anisse Ismaili

Anisse Ismaili

Efficiency in Multi-objective Games

cs.GT

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

In a multi-objective game, each agent individually evaluates each overall action-profile on multiple objectives. I generalize the price of anarchy to multi-objective games and provide a polynomial-time algorithm to assess it. This work asserts that policies on tobacco promote a higher economic efficiency.

[{'version': 'v1', 'created': 'Sat, 13 Jun 2015 11:03:52 GMT'} {'version': 'v2', 'created': 'Mon, 27 Jul 2015 08:47:23 GMT'}]

2015-07-28

[array(['Ismaili', 'Anisse', ''], dtype=object)]

2210.03663

Rados{\l}aw Kycia

Rados{\l}aw Antoni Kycia, Josef \v{S}ilhan

Inverting covariant exterior derivative

35 pages, 1 figure

math.DG math-ph math.AP math.MP math.OA

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

The algorithm for inverting covariant exterior derivative is provided. It works for a sufficiently small star-shaped region of a fibered set - a local subset of a vector bundle and associated vector bundle. The algorithm contains some constraints that can fail, giving no solution, which is the expected case for parallel transport equations. These constraints are straightforward to obtain in the proposed approach. The relation to operational calculus and operator theory is outlined. The upshot of this paper is to show, using the linear homotopy operator of the Poincare lemma, that we can solve the covariant constant and related equations in a geometric and algorithmic way.

[{'version': 'v1', 'created': 'Fri, 7 Oct 2022 16:12:03 GMT'} {'version': 'v2', 'created': 'Tue, 27 Dec 2022 10:08:38 GMT'} {'version': 'v3', 'created': 'Wed, 18 Jan 2023 14:26:01 GMT'} {'version': 'v4', 'created': 'Sat, 6 May 2023 08:28:54 GMT'}]

2023-05-09

[array(['Kycia', 'Radosław Antoni', ''], dtype=object) array(['Šilhan', 'Josef', ''], dtype=object)]

2109.00369

Shadab Mahboob

Shadab Mahboob (1), Koushik Kar (1) and Jacob Chakareski (2) ((1) Rensselaer Polytechnic Institute, (2) New Jersey Institute of Technology)

Decentralized Collaborative Video Caching in 5G Small-Cell Base Station Cellular Networks

11 pages, 10 figures, WiOpt 2021

cs.NI

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

We consider the problem of video caching across a set of 5G small-cell base stations (SBS) connected to each other over a high-capacity short-delay back-haul link, and linked to a remote server over a long-delay connection. Even though the problem of minimizing the overall video delivery delay is NP-hard, the Collaborative Caching Algorithm (CCA) that we present can efficiently compute a solution close to the optimal, where the degree of sub-optimality depends on the worst case video-to-cache size ratio. The algorithm is naturally amenable to distributed implementation that requires zero explicit coordination between the SBSs, and runs in $O(N + K \log K)$ time, where $N$ is the number of SBSs (caches) and $K$ the maximum number of videos. We extend CCA to an online setting where the video popularities are not known a priori but are estimated over time through a limited amount of periodic information sharing between SBSs. We demonstrate that our algorithm closely approaches the optimal integral caching solution as the cache size increases. Moreover, via simulations carried out on real video access traces, we show that our algorithm effectively uses the SBS caches to reduce the video delivery delay and conserve the remote server's bandwidth, and that it outperforms two other reference caching methods adapted to our system setting.

[{'version': 'v1', 'created': 'Wed, 1 Sep 2021 13:12:22 GMT'}]

2021-09-02

[array(['Mahboob', 'Shadab', ''], dtype=object) array(['Kar', 'Koushik', ''], dtype=object) array(['Chakareski', 'Jacob', ''], dtype=object)]

1910.08479

Dejan Gajic

Dejan Gajic and Claude Warnick

Quasinormal modes in extremal Reissner-Nordstr\"om spacetimes

75 pages, 6 figures; version accepted for publication in Communications in Mathematical Physics

Comm. Math. Phys. 385, p1395-1498 (2021)

10.1007/s00220-021-04137-4

gr-qc math.AP

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

We present a new framework for characterizing quasinormal modes (QNMs) or resonant states for the wave equation on asymptotically flat spacetimes, applied to the setting of extremal Reissner-Nordstr\"om black holes. We show that QNMs can be interpreted as honest eigenfunctions of generators of time translations acting on Hilbert spaces of initial data, corresponding to a suitable time slicing. The main difficulty that is present in the asymptotically flat setting, but is absent in the previously studied cases of asymptotically de Sitter or anti de Sitter sub-extremal black hole spacetimes, is that $L^2$-based Sobolev spaces are not suitable Hilbert space choices. Instead, we consider Hilbert spaces of functions that are additionally Gevrey regular at infinity and at the event horizon. We introduce $L^2$-based Gevrey estimates for the wave equation that are intimately connected to the existence of conserved quantities along null infinity and the event horizon. We relate this new framework to the traditional interpretation of quasinormal frequencies as poles of the meromorphic continuation of a resolvent operator and obtain new quantitative results in this setting.

[{'version': 'v1', 'created': 'Fri, 18 Oct 2019 15:53:34 GMT'} {'version': 'v2', 'created': 'Mon, 7 Jun 2021 16:23:41 GMT'}]

2021-10-15

[array(['Gajic', 'Dejan', ''], dtype=object) array(['Warnick', 'Claude', ''], dtype=object)]

2210.02744

Javid Naikoo

Swati Kumari, Javid Naikoo, Sibasish Ghosh, A. K. Pan

Interplay of nonlocality and incompatibility breaking qubit channels

Phys. Rev. A 107, 022201 (2023)

10.1103/PhysRevA.107.022201

quant-ph

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

Incompatibility and nonlocality are not only of foundational interest but also act as important resources for quantum information theory. In the Clauser-Horne-Shimony-Holt (CHSH) scenario, the incompatibility of a pair of observables is known to be equivalent to Bell nonlocality. Here, we investigate these notions in the context of qubit channels. The Bell-CHSH inequality has a greater perspective--compared to any genuine tripartite nonlocality scenario--while determining the interplay between nonlocality breaking qubit channels and incompatibility breaking qubit channels. In the Bell-CHSH scenario, we prove that if the conjugate of a channel is incompatibility breaking, then the channel is itself nonlocality breaking and vice versa. However, this equivalence is not straightforwardly generalized to multipartite systems, due to the absence of an equivalence relation between incompatibility and nonlocality in the multipartite scenario. We investigate this relation in the tripartite scenario by considering some well-known states like Greenberger-Horne-Zeilinger and $W$ states and using the notion of Mermin and Svetlichny nonlocality. By subjecting the parties in question to unital qubit channels, we identify the range of state and channel parameters for which incompatibility coexists with nonlocality. Further, we identify the set of unital qubit channels that is Mermin or Svetlichny nonlocality breaking irrespective of the input state.

[{'version': 'v1', 'created': 'Thu, 6 Oct 2022 08:28:52 GMT'} {'version': 'v2', 'created': 'Wed, 8 Feb 2023 16:01:42 GMT'} {'version': 'v3', 'created': 'Sat, 18 Feb 2023 12:13:04 GMT'}]

2023-02-21

[array(['Kumari', 'Swati', ''], dtype=object) array(['Naikoo', 'Javid', ''], dtype=object) array(['Ghosh', 'Sibasish', ''], dtype=object) array(['Pan', 'A. K.', ''], dtype=object)]

2210.00760

Silius M. Vandeskog

Silius M. Vandeskog, Sara Martino, Rapha\"el Huser

An Efficient Workflow for Modelling High-Dimensional Spatial Extremes

stat.ME stat.CO

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

A successful model for high-dimensional spatial extremes should, in principle, be able to describe both weakening extremal dependence at increasing levels and changes in the type of extremal dependence class as a function of the distance between locations. Furthermore, the model should allow for computationally tractable inference using inference methods that efficiently extract information from data and that are robust to model misspecification. In this paper, we demonstrate how to fulfil all these requirements by developing a comprehensive methodological workflow for efficient Bayesian modelling of high-dimensional spatial extremes using the spatial conditional extremes model while performing fast inference with R-INLA. We then propose a post hoc adjustment method that results in more robust inference by properly accounting for possible model misspecification. The developed methodology is applied for modelling extreme hourly precipitation from high-resolution radar data in Norway. Inference is computationally efficient, and the resulting model fit successfully captures the main trends in the extremal dependence structure of the data. Robustifying the model fit by adjusting for possible misspecification further improves model performance.

[{'version': 'v1', 'created': 'Mon, 3 Oct 2022 08:33:15 GMT'} {'version': 'v2', 'created': 'Tue, 13 Dec 2022 09:11:26 GMT'}]

2022-12-14

[array(['Vandeskog', 'Silius M.', ''], dtype=object) array(['Martino', 'Sara', ''], dtype=object) array(['Huser', 'Raphaël', ''], dtype=object)]

0704.1541

Elisabeth Remm

Elisabeth Remm, Michel Goze

Riemannian and Lorentzian structures on the non symmetric space SO(2m)/Sp(m)

10 pages. In French

math.DG math.RA

In this work, we are interested in a non symmetric homogeneous space, namely $SO(2m)/Sp(m)$. We show that this space admits a structure of $Z_2^2$-symmetric space. We describe all the non degenerated metrics and classify the Riemannian and Lorentzian ones.

[{'version': 'v1', 'created': 'Thu, 12 Apr 2007 08:05:12 GMT'}]

2007-05-23

[array(['Remm', 'Elisabeth', ''], dtype=object) array(['Goze', 'Michel', ''], dtype=object)]

2002.06914

Max Berrendorf

Max Berrendorf and Evgeniy Faerman and Laurent Vermue and Volker Tresp

On the Ambiguity of Rank-Based Evaluation of Entity Alignment or Link Prediction Methods

fixed a typo on page 6

cs.LG stat.ML

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

In this work, we take a closer look at the evaluation of two families of methods for enriching information from knowledge graphs: Link Prediction and Entity Alignment. In the current experimental setting, multiple different scores are employed to assess different aspects of model performance. We analyze the informativeness of these evaluation measures and identify several shortcomings. In particular, we demonstrate that all existing scores can hardly be used to compare results across different datasets. Moreover, we demonstrate that varying size of the test size automatically has impact on the performance of the same model based on commonly used metrics for the Entity Alignment task. We show that this leads to various problems in the interpretation of results, which may support misleading conclusions. Therefore, we propose adjustments to the evaluation and demonstrate empirically how this supports a fair, comparable, and interpretable assessment of model performance. Our code is available at https://github.com/mberr/rank-based-evaluation.

[{'version': 'v1', 'created': 'Mon, 17 Feb 2020 12:26:14 GMT'} {'version': 'v2', 'created': 'Wed, 4 Nov 2020 16:42:48 GMT'} {'version': 'v3', 'created': 'Fri, 16 Apr 2021 16:12:47 GMT'} {'version': 'v4', 'created': 'Mon, 2 May 2022 16:45:52 GMT'}]

2022-05-03

[array(['Berrendorf', 'Max', ''], dtype=object) array(['Faerman', 'Evgeniy', ''], dtype=object) array(['Vermue', 'Laurent', ''], dtype=object) array(['Tresp', 'Volker', ''], dtype=object)]

1801.01444

Shu Liu

Guang Chen, Shu Liu, Kejia Ren, Zhongnan Qu, Changhong Fu, Gereon Hinz, Alois Knoll

Deep Anticipation: Light Weight Intelligent Mobile Sensing in IoT by Recurrent Architecture

7 pages, 6 figures, 1 table

cs.CV

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

The rapid growth of IoT era is shaping the future of mobile services. Advanced communication technology enables a heterogeneous connectivity where mobile devices broadcast information to everything. Mobile applications such as robotics and vehicles connecting to cloud and surroundings transfer the short-range on-board sensor perception system to long-range mobile-sensing perception system. However, the mobile sensing perception brings new challenges for how to efficiently analyze and intelligently interpret the deluge of IoT data in mission- critical services. In this article, we model the challenges as latency, packet loss and measurement noise which severely deteriorate the reliability and quality of IoT data. We integrate the artificial intelligence into IoT to tackle these challenges. We propose a novel architecture that leverages recurrent neural networks (RNN) and Kalman filtering to anticipate motions and interac- tions between objects. The basic idea is to learn environment dynamics by recurrent networks. To improve the robustness of IoT communication, we use the idea of Kalman filtering and deploy a prediction and correction step. In this way, the architecture learns to develop a biased belief between prediction and measurement in the different situation. We demonstrate our approach with synthetic and real-world datasets with noise that mimics the challenges of IoT communications. Our method brings a new level of IoT intelligence. It is also lightweight compared to other state-of-the-art convolutional recurrent architecture and is ideally suitable for the resource-limited mobile applications.

[{'version': 'v1', 'created': 'Wed, 6 Dec 2017 02:45:04 GMT'} {'version': 'v2', 'created': 'Mon, 15 Oct 2018 20:34:00 GMT'}]

2018-10-17

[array(['Chen', 'Guang', ''], dtype=object) array(['Liu', 'Shu', ''], dtype=object) array(['Ren', 'Kejia', ''], dtype=object) array(['Qu', 'Zhongnan', ''], dtype=object) array(['Fu', 'Changhong', ''], dtype=object) array(['Hinz', 'Gereon', ''], dtype=object) array(['Knoll', 'Alois', ''], dtype=object)]

2205.06807

Fabricio Olivetti de Franca

Fabricio Olivetti de Franca

Transformation-Interaction-Rational Representation for Symbolic Regression

Accepted at the Genetic and Evolutionary Computation Conference 2022 (GECCO'22) Genetic Programming Track - Full paper

10.1145/3512290.3528695

cs.NE cs.LG

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

Symbolic Regression searches for a function form that approximates a dataset often using Genetic Programming. Since there is usually no restriction to what form the function can have, Genetic Programming may return a hard to understand model due to non-linear function chaining or long expressions. A novel representation called Interaction-Transformation was recently proposed to alleviate this problem. In this representation, the function form is restricted to an affine combination of terms generated as the application of a single univariate function to the interaction of selected variables. This representation obtained competing solutions on standard benchmarks. Despite the initial success, a broader set of benchmarking functions revealed the limitations of the constrained representation. In this paper we propose an extension to this representation, called Transformation-Interaction-Rational representation that defines a new function form as the rational of two Interaction-Transformation functions. Additionally, the target variable can also be transformed with an univariate function. The main goal is to improve the approximation power while still constraining the overall complexity of the expression. We tested this representation with a standard Genetic Programming with crossover and mutation. The results show a great improvement when compared to its predecessor and a state-of-the-art performance for a large benchmark.

[{'version': 'v1', 'created': 'Mon, 25 Apr 2022 16:53:43 GMT'}]

2022-05-16

[array(['de Franca', 'Fabricio Olivetti', ''], dtype=object)]

1009.6117

Eva Hackmann

Eva Hackmann, Valeria Kagramanova, Jutta Kunz, and Claus L\"ammerzahl

Analytical solution of the geodesic equation in Kerr-(anti) de Sitter space-times

18 pages, 11 figures

Phys.Rev.D81:044020,2010

10.1103/PhysRevD.81.044020

gr-qc

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

The complete analytical solutions of the geodesic equations in Kerr-de Sitter and Kerr-anti-de Sitter space-times are presented. They are expressed in terms of Weierstrass elliptic p, zeta, and sigma functions as well as hyperelliptic Kleinian sigma functions restricted to the one-dimensional theta-divisor. We analyze the dependency of timelike geodesics on the parameters of the space-time metric and the test-particle and compare the results with the situation in Kerr space-time with vanishing cosmological constant. Furthermore, we systematically can find all last stable spherical and circular orbits and derive the expressions of the deflection angle of flyby orbits, the orbital frequencies of bound orbits, the periastron shift, and the Lense-Thirring effect.

[{'version': 'v1', 'created': 'Thu, 30 Sep 2010 12:38:48 GMT'}]

2011-11-10

[array(['Hackmann', 'Eva', ''], dtype=object) array(['Kagramanova', 'Valeria', ''], dtype=object) array(['Kunz', 'Jutta', ''], dtype=object) array(['Lämmerzahl', 'Claus', ''], dtype=object)]

1309.6998

Neale Gibson

N. P. Gibson (1), S. Aigrain (2), J. K. Barstow (2), T. M. Evans (2), L. N. Fletcher (2), P. G. J. Irwin (2) ((1) ESO, (2) Oxford)

The optical transmission spectrum of the hot Jupiter HAT-P-32b: clouds explain the absence of broad spectral features?

17 pages, 11 figures, 2 tables, accepted for publication in MNRAS

10.1093/mnras/stt1783

astro-ph.EP

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

We report Gemini-North GMOS observations of the inflated hot Jupiter HAT-P-32b during two primary transits. We simultaneously observed two comparison stars and used differential spectro-photometry to produce multi-wavelength light curves. 'White' light curves and 29 'spectral' light curves were extracted for each transit and analysed to refine the system parameters and produce transmission spectra from 520-930nm in ~14nm bins. The light curves contain time-varying white noise as well as time-correlated noise, and we used a Gaussian process model to fit this complex noise model. Common mode corrections derived from the white light curve fits were applied to the spectral light curves which significantly improved our precision, reaching typical uncertainties in the transit depth of ~2x10^-4, corresponding to about half a pressure scale height. The low resolution transmission spectra are consistent with a featureless model, and we can confidently rule out broad features larger than about one scale height. The absence of Na/K wings or prominent TiO/VO features is most easily explained by grey absorption from clouds in the upper atmosphere, masking the spectral features. However, we cannot confidently rule out clear atmosphere models with low abundances (~10^-3 solar) of TiO, VO or even metal hydrides masking the Na and K wings. A smaller scale height or ionisation could also contribute to muted spectral features, but alone are unable to to account for the absence of features reported here.

[{'version': 'v1', 'created': 'Thu, 26 Sep 2013 18:19:05 GMT'}]

2015-06-17

[array(['Gibson', 'N. P.', '', 'ESO'], dtype=object) array(['Aigrain', 'S.', '', 'Oxford'], dtype=object) array(['Barstow', 'J. K.', '', 'Oxford'], dtype=object) array(['Evans', 'T. M.', '', 'Oxford'], dtype=object) array(['Fletcher', 'L. N.', '', 'Oxford'], dtype=object) array(['Irwin', 'P. G. J.', '', 'Oxford'], dtype=object)]

2111.10928

D Bayani

David Bayani

WalkingTime: Dynamic Graph Embedding Using Temporal-Topological Flows

15 pages: 10 pages body, 2.5 pages references, remainder appendix ; 3 figures

cs.LG cs.SI

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

Increased attention has been paid over the last four years to dynamic network embedding. Existing dynamic embedding methods, however, consider the problem as limited to the evolution of a topology over a sequence of global, discrete states. We propose a novel embedding algorithm, WalkingTime, based on a fundamentally different handling of time, allowing for the local consideration of continuously occurring phenomena; while others consider global time-steps to be first-order citizens of the dynamic environment, we hold flows comprised of temporally and topologically local interactions as our primitives, without any discretization or alignment of time-related attributes being necessary. Keywords: dynamic networks , representation learning , dynamic graph embedding , time-respecting paths , temporal-topological flows , temporal random walks , temporal networks , real-attributed knowledge graphs , streaming graphs , online networks , asynchronous graphs , asynchronous networks , graph algorithms , deep learning , network analysis , datamining , network science

[{'version': 'v1', 'created': 'Mon, 22 Nov 2021 00:04:02 GMT'}]

2021-11-23

[array(['Bayani', 'David', ''], dtype=object)]

1210.6039

Sangmo Sohn

Sangmo Tony Sohn (1), Gurtina Besla (2), Roeland P. van der Marel (1), Michael Boylan-Kolchin (3), Steven R. Majewski (4), James S. Bullock (3) ((1) STScI, (2) Columbia University, (3) UC Irvine, (4) University of Virginia)

The Space Motion of Leo I: Hubble Space Telescope Proper Motion and Implied Orbit

21 pages, 14 figures, 4 tables; Accepted for publication in the Astrophysical Journal

ApJ 768 139 (2013)

10.1088/0004-637X/768/2/139

astro-ph.GA

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

We present the first absolute proper motion measurement of Leo I, based on two epochs of HST ACS/WFC images separated by ~5 years. The average shift of Leo I stars with respect to ~100 background galaxies implies a proper motion of (mu_W, mu_N) = (0.1140 +/- 0.0295, -0.1256 +/- 0.0293) mas/yr. The implied Galactocentric velocity vector, corrected for the reflex motion of the Sun, has radial and tangential components V_rad = 167.9 +/- 2.8 km/s and V_tan = 101.0 +/- 34.4 km/s, respectively. We study the detailed orbital history of Leo I by solving its equations of motion backward in time for a range of plausible mass models for the Milky Way and its surrounding galaxies. Leo I entered the Milky Way virial radius 2.33 +/- 0.21 Gyr ago, most likely on its first infall. It had a pericentric approach 1.05 +/- 0.09 Gyr ago at a Galactocentric distance of 91 +/- 36 kpc. We associate these time scales with characteristic time scales in Leo I's star formation history, which shows an enhanced star formation activity ~2 Gyr ago and quenching ~1 Gyr ago. There is no indication from our calculations that other galaxies have significantly influenced Leo I's orbit, although there is a small probability that it may have interacted with either Ursa Minor or Leo II within the last ~1 Gyr. For most plausible Milky Way masses, the observed velocity implies that Leo I is bound to the Milky Way. However, it may not be appropriate to include it in models of the Milky Way satellite population that assume dynamical equilibrium, given its recent infall. Solution of the complete (non-radial) timing equations for the Leo I orbit implies a Milky Way mass M_MW,vir = 3.15 (-1.36, +1.58) x 10^12 Msun, with the large uncertainty dominated by cosmic scatter. In a companion paper, we compare the new observations to the properties of Leo I subhalo analogs extracted from cosmological simulations.

[{'version': 'v1', 'created': 'Mon, 22 Oct 2012 20:00:04 GMT'} {'version': 'v2', 'created': 'Fri, 26 Apr 2013 01:41:14 GMT'}]

2013-04-29

[array(['Sohn', 'Sangmo Tony', ''], dtype=object) array(['Besla', 'Gurtina', ''], dtype=object) array(['van der Marel', 'Roeland P.', ''], dtype=object) array(['Boylan-Kolchin', 'Michael', ''], dtype=object) array(['Majewski', 'Steven R.', ''], dtype=object) array(['Bullock', 'James S.', ''], dtype=object)]

quant-ph/0406221

Stefan Yoshi Buhmann

S. Y. Buhmann, Ho Trung Dung, T. Kampf, L. Kn\"oll, and D.-G. Welsch

Atoms near magnetodielectric bodies: van-der-Waals energy and Casimir-Polder force

14 pages, 2 figures, presented at: X International Conference on Quantum Optics, Minsk, Belarus, May 30 - June 3, 2004

Optics and Spectroscopy (USSR) 99 (3), 466 (2005)

10.1134/1.2055945

quant-ph

Based on macroscopic QED in linear, causal media, we present a consistent theory for the Casimir-Polder force acting on an atom positioned near dispersing and absorbing magnetodielectric bodies. The perturbative result for the van-der-Waals energy is shown to exhibit interesting new features in the presence of magnetodielectric bodies. To go beyond perturbation theory, we start with the center-of-mass equation of motion and derive a dynamical expression for the Casimir-Polder force acting on an atom prepared in an arbitrary electronic state. For a non-driven atom in the weak coupling regime, the force as a function of time is shown to be a superposition of force components that are related to the electronic density matrix elements at chosen time. These force components depend on the position-dependent polarizability of the atom that correctly accounts for the body-induced level shifts and broadenings.

[{'version': 'v1', 'created': 'Tue, 29 Jun 2004 16:09:31 GMT'}]

2016-08-16

[array(['Buhmann', 'S. Y.', ''], dtype=object) array(['Dung', 'Ho Trung', ''], dtype=object) array(['Kampf', 'T.', ''], dtype=object) array(['Knöll', 'L.', ''], dtype=object) array(['Welsch', 'D. -G.', ''], dtype=object)]

2212.09115

Heshan Aravinda

Heshan Aravinda

Entropy-variance inequalities for discrete log-concave random variables via degree of freedom

20 pages; typos corrected

math.PR cs.IT math.IT

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

We utilize a discrete version of the notion of degree of freedom to prove a sharp min-entropy-variance inequality for integer valued log-concave random variables. More specifically, we show that the geometric distribution minimizes the min-entropy within the class of log-concave probability sequences with fixed variance. As an application, we obtain a discrete R\'enyi entropy power inequality in the log-concave case, which improves a result of Bobkov, Marsiglietti and Melbourne (2022).

[{'version': 'v1', 'created': 'Sun, 18 Dec 2022 16:01:03 GMT'} {'version': 'v2', 'created': 'Mon, 26 Dec 2022 02:41:52 GMT'} {'version': 'v3', 'created': 'Mon, 2 Jan 2023 17:37:35 GMT'}]

2023-01-03

[array(['Aravinda', 'Heshan', ''], dtype=object)]

2202.11486

Mauricio Orbes Arteaga

Mauricio Orbes-Arteaga, Thomas Varsavsky, Lauge Sorensen, Mads Nielsen, Akshay Pai, Sebastien Ourselin, Marc Modat, and M Jorge Cardoso

Augmentation based unsupervised domain adaptation

eess.IV cs.CV cs.LG

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

The insertion of deep learning in medical image analysis had lead to the development of state-of-the art strategies in several applications such a disease classification, as well as abnormality detection and segmentation. However, even the most advanced methods require a huge and diverse amount of data to generalize. Because in realistic clinical scenarios, data acquisition and annotation is expensive, deep learning models trained on small and unrepresentative data tend to outperform when deployed in data that differs from the one used for training (e.g data from different scanners). In this work, we proposed a domain adaptation methodology to alleviate this problem in segmentation models. Our approach takes advantage of the properties of adversarial domain adaptation and consistency training to achieve more robust adaptation. Using two datasets with white matter hyperintensities (WMH) annotations, we demonstrated that the proposed method improves model generalization even in corner cases where individual strategies tend to fail.

[{'version': 'v1', 'created': 'Wed, 23 Feb 2022 13:06:07 GMT'}]

2022-02-24

[array(['Orbes-Arteaga', 'Mauricio', ''], dtype=object) array(['Varsavsky', 'Thomas', ''], dtype=object) array(['Sorensen', 'Lauge', ''], dtype=object) array(['Nielsen', 'Mads', ''], dtype=object) array(['Pai', 'Akshay', ''], dtype=object) array(['Ourselin', 'Sebastien', ''], dtype=object) array(['Modat', 'Marc', ''], dtype=object) array(['Cardoso', 'M Jorge', ''], dtype=object)]

astro-ph/9601043

David A. Buote

David A. Buote and Claude R. Canizares (MIT)

The Twisting X-ray Isophotes of the Elliptical Galaxy NGC 720

17 pages (3 figures), AASTeX manuscript with PostScript figures, to appear in ApJ September 10, 1996. Only a few minor cosmetic changes in this version

Astrophys.J. 468 (1996) 184

10.1086/177680

CSR-96-01

astro-ph

We present spatial analysis of the deep (57ks) ROSAT HRI X-ray image of the E4 galaxy NGC 720. The orientation of the HRI surface brightness is consistent with the optical position angle $(PA)$ interior to semi-major axis $a\sim 60\arcsec$ (optical $R_e\sim 50\arcsec$). For larger $a$ the isophotes twist and eventually $(a\gtrsim 100\arcsec)$ orient along a direction consistent with the $PA$ measured with the PSPC data (Buote & Canizares 1994) -- the $\sim 30\arcdeg$ twist is significant at an estimated 99% confidence level. We argue that this twist is not the result of projected foreground and background sources, ram pressure effects, or tidal distortions. If spheroidal symmetry and a nearly isothermal hot gas are assumed, then the azimuthally averaged radial profile displays features which, when combined with the observed $PA$ twist, are inconsistent with the simple assumptions that the X-ray emission is due either entirely to hot gas or to the combined emission from hot gas and discrete sources. We discuss possible origins of the $PA$ twist and radial profile features (e.g., triaxiality).

[{'version': 'v1', 'created': 'Wed, 10 Jan 1996 15:56:30 GMT'} {'version': 'v2', 'created': 'Thu, 11 Apr 1996 15:47:29 GMT'}]

2009-10-28

[array(['Buote', 'David A.', '', 'MIT'], dtype=object) array(['Canizares', 'Claude R.', '', 'MIT'], dtype=object)]

1907.03725

Oleg Butkovsky

Oleg Butkovsky, Michael Scheutzow

Couplings via comparison principle and exponential ergodicity of SPDEs in the hypoelliptic setting

10.1007/s00220-020-03834-w

math.PR math-ph math.MP

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

We develop a general framework for studying ergodicity of order-preserving Markov semigroups. We establish natural and in a certain sense optimal conditions for existence and uniqueness of the invariant measure and exponential convergence of transition probabilities of an order-preserving Markov process. As an application, we show exponential ergodicity and exponentially fast synchronization-by-noise of the stochastic reaction-diffusion equation in the hypoelliptic setting. This refines and complements corresponding results of Hairer, Mattingly (2011).

[{'version': 'v1', 'created': 'Mon, 8 Jul 2019 17:09:05 GMT'} {'version': 'v2', 'created': 'Sun, 31 May 2020 22:55:12 GMT'}]

2020-10-28

[array(['Butkovsky', 'Oleg', ''], dtype=object) array(['Scheutzow', 'Michael', ''], dtype=object)]

2201.07531

Aemilius van Vondelen

Aemilius A W van Vondelen, Alexandros Iliopoulos, Sachin T Navalkar, Daan C van der Hoek, and Jan-Willem van Wingerden

Damping Identification of an Operational Offshore Wind Turbine using Kalman filter-based Subspace Identification

17 pages

eess.SP cs.SY eess.SY

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

Operational Modal Analysis (OMA) provides essential insights into the structural dynamics of an Offshore Wind Turbine (OWT). In these dynamics, damping is considered an especially important parameter as it governs the magnitude of the response at the natural frequencies. Violation of the stationary white noise excitation requirement of classical OMA algorithms has troubled the identification of operational OWTs due to harmonic excitation caused by rotor rotation. Recently, a novel algorithm was presented that mitigates harmonics by estimating a harmonic subsignal using a Kalman filter and orthogonally removing this signal from the response signal, after which the Stochastic Subspace Identification algorithm is used to identify the system. In this paper, the algorithm is tested on field data obtained from a multi-megawatt operational OWT using an economical sensor setup with two accelerometer levels. The first three tower bending modes could be distinguished, and, through the LQ-decomposition used in the algorithm, the identification results could be improved further by concatenating multiple datasets. A comparison against established harmonics-mitigating algorithms, Modified Least-squared Complex Exponential and PolyMAX, was done to validate the results.

[{'version': 'v1', 'created': 'Wed, 19 Jan 2022 11:20:34 GMT'} {'version': 'v2', 'created': 'Wed, 7 Sep 2022 11:46:43 GMT'}]

2022-09-08

[array(['van Vondelen', 'Aemilius A W', ''], dtype=object) array(['Iliopoulos', 'Alexandros', ''], dtype=object) array(['Navalkar', 'Sachin T', ''], dtype=object) array(['van der Hoek', 'Daan C', ''], dtype=object) array(['van Wingerden', 'Jan-Willem', ''], dtype=object)]

1606.05932

Zhiming Lin

Zhiming Lin

Surfaces with $\chi=5, K^{2}=9$ and a canonical involution

18 pages. arXiv admin note: text overlap with arXiv:math/0603094 by other authors

math.AG

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

In this paper, we classify the minimal surfaces of general type with $\chi=5$, $K^{2}=9$ whose canonical map is composed with an involution. We obtain 6 families, whose dimensions in the moduli space are 28, 27, 33, 32, 31 and 32 respectively. Among them, the family of surfaces having a genus 2 fibration forms an irreducible component of $\mathfrak{M}_{\chi=5, K^{2}=9}$.

[{'version': 'v1', 'created': 'Mon, 20 Jun 2016 00:42:05 GMT'}]

2016-06-21

[array(['Lin', 'Zhiming', ''], dtype=object)]

1711.01447

Emmanouil Panaousis Dr

Emmanouil Panaousis, Eirini Karapistoli, Hadeer Elsemary, Tansu Alpcan, MHR Khuzani, Anastasios A.Economides

Game theoretic path selection to support security in device-to-device communications

35 pages, 7 figures

Ad Hoc Networks (2017), 28-42

10.1016/j.adhoc.2016.11.008.

cs.GT

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

Device-to-Device (D2D) communication is expected to be a key feature supported by 5G networks, especially due to the proliferation of Mobile Edge Computing (MEC), which has a prominent role in reducing network stress by shifting computational tasks from the Internet to the mobile edge. Apart from being part of MEC, D2D can extend cellular coverage allowing users to communicate directly when telecommunication infrastructure is highly congested or absent. This significant departure from the typical cellular paradigm imposes the need for decentralised network routing protocols. Moreover, enhanced capabilities of mobile devices and D2D networking will likely result in proliferation of new malware types and epidemics. Although the literature is rich in terms of D2D routing protocols that enhance quality-of-service and energy consumption, they provide only basic security support, e.g., in the form of encryption. Routing decisions can, however, contribute to collaborative detection of mobile malware by leveraging different kinds of anti-malware software installed on mobile devices. Benefiting from the cooperative nature of D2D communications, devices can rely on each other's contributions to detect malware. The impact of our work is geared towards having more malware-free D2D networks. To achieve this, we designed and implemented a novel routing protocol for D2D communications that optimises routing decisions for explicitly improving malware detection. The protocol identifies optimal network paths, in terms of malware mitigation and energy spent for malware detection, based on a game theoretic model. Diverse capabilities of network devices running different types of anti-malware software and their potential for inspecting messages relayed towards an intended destination device are leveraged using game theoretic tools. An optimality analysis of both Nash and Stackelberg security games is undertaken, including both zero and non-zero sum variants, and the Defender's equilibrium strategies. By undertaking network simulations, theoretical results obtained are illustrated through randomly generated network scenarios showing how our protocol outperforms conventional routing protocols, in terms of expected payoff, which consists of: security damage in inflicted by malware and malware detection cost.

[{'version': 'v1', 'created': 'Sat, 4 Nov 2017 15:07:48 GMT'}]

2017-11-07

[array(['Panaousis', 'Emmanouil', ''], dtype=object) array(['Karapistoli', 'Eirini', ''], dtype=object) array(['Elsemary', 'Hadeer', ''], dtype=object) array(['Alpcan', 'Tansu', ''], dtype=object) array(['Khuzani', 'MHR', ''], dtype=object) array(['Economides', 'Anastasios A.', ''], dtype=object)]

1810.10852

Ruslan Feshchenko

R M Feshchenko and A.V. Vinogradov

On the number and spin of photons in classical electromagnetic field

5 pages, to be submitted to Eur. J. Phys

Physica Scripta, 94(6), 065501 (2019)

10.1088/1402-4896/ab0fc2

physics.class-ph

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

A relativistically invariant expression for the number of photons in free classical electromagnetic field through the currents, that created the field, is derived based on the formula for the total energy--momentum of the field. It is demonstrated that it corresponds to the classical limit of the photon number operator known from the quantum electrodynamics. An expression for the total spin moment of the classical electromagnetic field is derived and it is shown that it can be interpreted in terms of spin moments of elementary photons. Similar to the total number of photons the classical spin moment is the limit of the quantum operator of the total spin. It is revealed that the total number of photons as well as the total spin moment are related to each other through a second order tensor, which can be expressed through currents that created the field.

[{'version': 'v1', 'created': 'Thu, 25 Oct 2018 13:00:05 GMT'}]

2021-05-21

[array(['Feshchenko', 'R M', ''], dtype=object) array(['Vinogradov', 'A. V.', ''], dtype=object)]

1907.02325

Francisco Martin Cabrera

Francisco Mart\'in Cabrera

Harmonic almost contact metric manifolds revisited

29 pages

math.DG

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

The study of harmonicity for almost contact metric structures was initiated by Vergara-D\'iaz and Wood and continued by Gonz\'alez-D\'avila and the present author. By using the intrinsic torsion and some restriction on the type of almost contact metric structure, Gonz\'alez-D\'avila and the present author have characterised harmonic structures by showing conditions relating harmonicity and classes of almost contact metric structures. Here we do this in a more general context. Moreover, the harmonicity of almost contact metric structures as a map is also done in such a general context. Finally, some remarks on the classification of almost contact metric structures are exposed.

[{'version': 'v1', 'created': 'Thu, 4 Jul 2019 10:53:24 GMT'}]

2019-07-05

[array(['Cabrera', 'Francisco Martín', ''], dtype=object)]

2003.03699

Depeng Xu

Depeng Xu, Wei Du and Xintao Wu

Removing Disparate Impact of Differentially Private Stochastic Gradient Descent on Model Accuracy

cs.LG cs.CR cs.CY stat.ML

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

When we enforce differential privacy in machine learning, the utility-privacy trade-off is different w.r.t. each group. Gradient clipping and random noise addition disproportionately affect underrepresented and complex classes and subgroups, which results in inequality in utility loss. In this work, we analyze the inequality in utility loss by differential privacy and propose a modified differentially private stochastic gradient descent (DPSGD), called DPSGD-F, to remove the potential disparate impact of differential privacy on the protected group. DPSGD-F adjusts the contribution of samples in a group depending on the group clipping bias such that differential privacy has no disparate impact on group utility. Our experimental evaluation shows how group sample size and group clipping bias affect the impact of differential privacy in DPSGD, and how adaptive clipping for each group helps to mitigate the disparate impact caused by differential privacy in DPSGD-F.

[{'version': 'v1', 'created': 'Sun, 8 Mar 2020 02:06:15 GMT'} {'version': 'v2', 'created': 'Sun, 27 Sep 2020 21:04:37 GMT'}]

2020-09-29

[array(['Xu', 'Depeng', ''], dtype=object) array(['Du', 'Wei', ''], dtype=object) array(['Wu', 'Xintao', ''], dtype=object)]

2005.08519

Hanna Abi Akl

Hanna Abi Akl, Dominique Mariko, Estelle Labidurie

Yseop at SemEval-2020 Task 5: Cascaded BERT Language Model for Counterfactual Statement Analysis

cs.CL stat.ML

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

In this paper, we explore strategies to detect and evaluate counterfactual sentences. We describe our system for SemEval-2020 Task 5: Modeling Causal Reasoning in Language: Detecting Counterfactuals. We use a BERT base model for the classification task and build a hybrid BERT Multi-Layer Perceptron system to handle the sequence identification task. Our experiments show that while introducing syntactic and semantic features does little in improving the system in the classification task, using these types of features as cascaded linear inputs to fine-tune the sequence-delimiting ability of the model ensures it outperforms other similar-purpose complex systems like BiLSTM-CRF in the second task. Our system achieves an F1 score of 85.00% in Task 1 and 83.90% in Task 2.

[{'version': 'v1', 'created': 'Mon, 18 May 2020 08:19:18 GMT'} {'version': 'v2', 'created': 'Fri, 13 Nov 2020 17:35:42 GMT'}]

2020-11-16

[array(['Akl', 'Hanna Abi', ''], dtype=object) array(['Mariko', 'Dominique', ''], dtype=object) array(['Labidurie', 'Estelle', ''], dtype=object)]

2011.13657

Lirong Deng

Lirong Deng, Xuan Zhang, Tianshu Yang, Hongbin Sun, Shmuel S. Oren

Community Energy Storage Management for Welfare Optimization Using a Markov Decision Process

eess.SY cs.SY

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

In this paper, we address an optimal management problem of community energy storage in the real-time electricity market under a stochastic renewable environment. In a real-time electricity market, complete market information may not be assessable for a strategic participant, hence we propose a paradigm that uses partial information including the forecast of real-time prices and slopes of the aggregate supply curve to model the price impact of storage use in the price-maker storage management problem. As a price maker, the community energy storage can not only earn profits through energy arbitrage but also smooth price trajectories and further influence social welfare. We formulate the problem as a finite-horizon Markov decision process that aims to maximize the energy arbitrage and social welfare of the prosumer-based community. The advance of the management scheme is that the optimal policy has a threshold structure. The structure has an analytic form that can guide the energy storage to charge/discharge by comparing its current marginal value and the expected future marginal value. Case studies indicate that welfare-maximizing storage earns more benefits than profit-maximizing storage. The proposed threshold-based algorithm can guarantee optimality and largely decrease the computational complexity of standard stochastic dynamic programming.

[{'version': 'v1', 'created': 'Fri, 27 Nov 2020 10:52:24 GMT'}]

2020-11-30

[array(['Deng', 'Lirong', ''], dtype=object) array(['Zhang', 'Xuan', ''], dtype=object) array(['Yang', 'Tianshu', ''], dtype=object) array(['Sun', 'Hongbin', ''], dtype=object) array(['Oren', 'Shmuel S.', ''], dtype=object)]

2103.10439

Hosein Haghi

Hamidreza Mahani, Akram Hasani Zonoozi, Hosein Haghi, Tereza Jerabkova, Pavel Kroupa, Steffen Mieske

Do ultra compact dwarf galaxies form monolithically or as merged star cluster complexes?

Accepted for publication in MNRAS. 16 pages, 11 figures, 1 table

2021, MNRAS, 502, 5185

10.1093/mnras/stab330

astro-ph.GA

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

Some ultra-compact dwarf galaxies (UCDs) have elevated observed dynamical V-band mass-to-light ($M/L_{\rm V}$) ratios with respect to what is expected from their stellar populations assuming a canonical initial mass function (IMF). Observations have also revealed the presence of a compact dark object in the centers of several UCDs, having a mass of a few to 15\% of the present-day stellar mass of the UCD. This central mass concentration has typically been interpreted as a super-massive black hole, but can in principle also be a sub-cluster of stellar remnants. We explore the following two formation scenarios of UCDs, i) monolithic collapse and ii) mergers of star clusters in cluster complexes as are observed in massively star-bursting regions. We explore the physical properties of the UCDs at different evolutionary stages assuming different initial stellar masses of the UCDs and the IMF being either universal or changing systematically with metallicity and density according to the Integrated Galactic IMF (IGIMF) theory. While the observed elevated $M/L_{\rm V}$ ratios of the UCDs cannot be reproduced if the IMF is invariant and universal, the empirically derived IMF which varies systematically with density and metallicity shows agreement with the observations. Incorporating the UCD-mass-dependent retention fraction of dark remnants improves this agreement. In addition we apply the results of N-body simulations to young UCDs and show that the same initial conditions describing the observed $M/L_{\rm V}$ ratios reproduce the observed relation between the half-mass radii and the present-day masses of the UCDs. The findings thus suggest that the majority of UCDs that have elevated $M/L_{\rm V}$ ratios could have formed monolithically with significant remnant-mass components that are centrally concentrated, while those with small $M/L_V$ values may be merged star-cluster complexes.

[{'version': 'v1', 'created': 'Thu, 18 Mar 2021 18:00:01 GMT'}]

2021-03-22

[array(['Mahani', 'Hamidreza', ''], dtype=object) array(['Zonoozi', 'Akram Hasani', ''], dtype=object) array(['Haghi', 'Hosein', ''], dtype=object) array(['Jerabkova', 'Tereza', ''], dtype=object) array(['Kroupa', 'Pavel', ''], dtype=object) array(['Mieske', 'Steffen', ''], dtype=object)]

2009.02946

Max Philipp Holl

Max Philipp Holl, Andrew J. Archer and Uwe Thiele

Efficient calculation of phase coexistence and phase diagrams: application to a binary phase-field crystal model

J. Phys.: Condens. Matter 33, 115401 (2021)

10.1088/1361-648X/abce6e

cond-mat.soft

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

We show that one can employ well-established numerical continuation methods to efficiently calculate the phase diagram for thermodynamic systems. In particular, this involves the determination of lines of phase coexistence related to first order phase transitions and the continuation of triple points. To illustrate the method we apply it to a binary Phase-Field-Crystal model for the crystallisation of a mixture of two types of particles. The resulting phase diagram is determined for one- and two-dimensional domains. In the former case it is compared to the diagram obtained from a one-mode approximation. The various observed liquid and crystalline phases and their stable and metastable coexistence are discussed as well as the temperature-dependence of the phase diagrams. This includes the (dis)appearance of critical points and triple points. We also relate bifurcation diagrams for finite-size systems to the thermodynamics of phase transitions in the infinite-size limit.

[{'version': 'v1', 'created': 'Mon, 7 Sep 2020 08:51:11 GMT'}]

2021-01-22

[array(['Holl', 'Max Philipp', ''], dtype=object) array(['Archer', 'Andrew J.', ''], dtype=object) array(['Thiele', 'Uwe', ''], dtype=object)]

0712.3124

Colferai Dimitri

Dimitri Colferai

A solvable model for small-x physics in D > 4 dimensions

30 pages, 9 figures

JHEP 0804:103,2008

10.1088/1126-6708/2008/04/103

DFF 439/11/07

hep-ph

I present a simplified model for the gluon Green's function governing high-energy QCD dynamics, in arbitrary space-time dimensions. The BFKL integral equation (either with or without running coupling) reduces to a second order differential equation that can be solved in terms of Bessel and hypergeometric functions. Explicit expressions for the gluon density and its anomalous dimension are derived in MS and Q_0 factorization schemes. This analysis illustrates the qualitative features of the QCD gluon density in both factorization schemes. In addition, it clarifies the mathematical properties and validates the results of the ``gamma-representation'' method proposed by M.Ciafaloni and myself for extracting resummed next-to-leading-log x anomalous dimensions of phenomenological relevance in the two schemes.

[{'version': 'v1', 'created': 'Wed, 19 Dec 2007 09:21:29 GMT'}]

2009-02-18

[array(['Colferai', 'Dimitri', ''], dtype=object)]

cond-mat/0510083

Stefano Sanvito

A. R. Rocha, V. M. Garc\'ia-Su\'arez, S. Bailey, C. Lambert, J. Ferrer and S. Sanvito

The Smeagol method for spin- and molecular-electronics

For additional materials on this topic please follow http://www.smeagol.tcd.ie

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

{\it Ab initio} computational methods for electronic transport in nanoscaled systems are an invaluable tool for the design of quantum devices. We have developed a flexible and efficient algorithm for evaluating $I$-$V$ characteristics of atomic junctions, which integrates the non-equilibrium Green's function method with density functional theory. This is currently implemented in the package {\it Smeagol}. The heart of {\it Smeagol} is our novel scheme for constructing the surface Green's functions describing the current/voltage probes. It consists of a direct summation of both open and closed scattering channels together with a regularization procedure of the Hamiltonian, and provides great improvements over standard recursive methods. In particular it allows us to tackle material systems with complicated electronic structures, such as magnetic transition metals. Here we present a detailed description of {\it Smeagol} together with an extensive range of applications relevant for the two burgeoning fields of spin and molecular-electronics.

[{'version': 'v1', 'created': 'Tue, 4 Oct 2005 14:53:27 GMT'}]

2016-08-16

[array(['Rocha', 'A. R.', ''], dtype=object) array(['García-Suárez', 'V. M.', ''], dtype=object) array(['Bailey', 'S.', ''], dtype=object) array(['Lambert', 'C.', ''], dtype=object) array(['Ferrer', 'J.', ''], dtype=object) array(['Sanvito', 'S.', ''], dtype=object)]

1710.09077

Gunjan Sehgal

Gunjan Sehgal, Bindu Gupta, Kaushal Paneri, Karamjit Singh, Geetika Sharma, Gautam Shroff

Crop Planning using Stochastic Visual Optimization

5 pages

cs.CV cs.CY

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

As the world population increases and arable land decreases, it becomes vital to improve the productivity of the agricultural land available. Given the weather and soil properties, farmers need to take critical decisions such as which seed variety to plant and in what proportion, in order to maximize productivity. These decisions are irreversible and any unusual behavior of external factors, such as weather, can have catastrophic impact on the productivity of crop. A variety which is highly desirable to a farmer might be unavailable or in short supply, therefore, it is very critical to evaluate which variety or varieties are more likely to be chosen by farmers from a growing region in order to meet demand. In this paper, we present our visual analytics tool, ViSeed, showcased on the data given in Syngenta 2016 crop data challenge 1 . This tool helps to predict optimal soybean seed variety or mix of varieties in appropriate proportions which is more likely to be chosen by farmers from a growing region. It also allows to analyse solutions generated from our approach and helps in the decision making process by providing insightful visualizations

[{'version': 'v1', 'created': 'Wed, 25 Oct 2017 05:16:28 GMT'}]

2017-10-26

[array(['Sehgal', 'Gunjan', ''], dtype=object) array(['Gupta', 'Bindu', ''], dtype=object) array(['Paneri', 'Kaushal', ''], dtype=object) array(['Singh', 'Karamjit', ''], dtype=object) array(['Sharma', 'Geetika', ''], dtype=object) array(['Shroff', 'Gautam', ''], dtype=object)]

1303.7073

Franz X. Bronold

Rafael L. Heinisch, Franz X. Bronold, and Holger Fehske

Surface electrons at plasma walls

To appear in Complex Plasmas: Scientific Challenges and Technological Opportunities, Editors: M. Bonitz, K. Becker, J. Lopez and H. Thomsen

physics.plasm-ph

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

In this chapter we introduce a microscopic modelling of the surplus electrons on the plasma wall which complements the classical description of the plasma sheath. First we introduce a model for the electron surface layer to study the quasistationary electron distribution and the potential at an unbiased plasma wall. Then we calculate sticking coefficients and desorption times for electron trapping in the image states. Finally we study how surplus electrons affect light scattering and how charge signatures offer the possibility of a novel charge measurement for dust grains.

[{'version': 'v1', 'created': 'Thu, 28 Mar 2013 08:59:51 GMT'}]

2013-03-29

[array(['Heinisch', 'Rafael L.', ''], dtype=object) array(['Bronold', 'Franz X.', ''], dtype=object) array(['Fehske', 'Holger', ''], dtype=object)]

2103.05054

Luiz Carlos Ryff

Luiz Carlos Ryff

Comment on Wave-particle duality revisited: Neither wave nor particle

quant-ph

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

In a recent article Jan Sperling, Syamsundar De, Thomas Nitsche, Johannes Tiedau, Sonja Barkhofen, Benjamin Brecht, and Christine Silberhorn discuss the wave-particle duality using an experiment to demonstrate that "neither the wave nor the particle description is sufficient to predict the utcomes of quantum-optical experiments." I would like to draw your attention to two previous papers that discuss feasible experiments in which a photon does not seem to behave either as particle or as wave and make some brief considerations on the topic.

[{'version': 'v1', 'created': 'Mon, 8 Mar 2021 20:16:58 GMT'}]

2021-03-10

[array(['Ryff', 'Luiz Carlos', ''], dtype=object)]

2212.13510

Harshavardhan Reddy Kalluru

Harshavardhan R. Kalluru and Binita Tongbram and Jaydeep K. Basu

Determination of the ensemble transition dipole moments of self-assembled quantum dot films by time and angle resolved emission spectroscopy measurements

physics.optics

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

The spontaneous emission of light in semiconductors is due to the excitonic relaxation process. The emission of light requires a change in the transition dipole matrix of the system. This is captured in terms of the physical quantity called transition dipole moment. The transition dipole moment (TDM) characterizes the line strength of the emission process. TDM is of fundamental importance in emitter-cavity interaction as its magnitude decides the interaction strength of emitters and cavities. In all light emitting devices, the orientation of the transition dipole moments is directly related to the optical power output of the devices. In this manuscript, the basic framework of spontaneous emission and Einstein coefficients is discussed for two level systems. Semiconducting alloyed quantum dots (AQDs) are synthesized in hydrophobic phase. AQDs are used as the experimental two level system. The AQDs are then self-assembled into monolayers by the Langmuir-Schaefer method. The ensemble averaged TDM magnitude and orientation of AQDs are extracted from the time resolved and the angle resolved emission spectroscopy measurements respectively. The procedure for finding out the TDM, described in this manuscript is generalized. The mentioned procedure can be extended to any emitters in hydrophobic phase.

[{'version': 'v1', 'created': 'Tue, 27 Dec 2022 14:51:34 GMT'}]

2022-12-29

[array(['Kalluru', 'Harshavardhan R.', ''], dtype=object) array(['Tongbram', 'Binita', ''], dtype=object) array(['Basu', 'Jaydeep K.', ''], dtype=object)]

1204.5087

Martin Kiffner

Pierre-Louis Giscard, Martin Kiffner, Dieter Jaksch

The walk-sum method for simulating quantum many-body systems

This paper has been withdrawn because of as yet unresolved convergence issues of the method

quant-ph math-ph math.MP

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

We present the method of walk-sum to study the real-time dynamics of interacting quantum many-body systems. The walk-sum method generates explicit expressions for any desired pieces of an evolution operator U independently of any others. The computational cost for evaluating any such piece at a fixed order grows polynomially with the number of particles. Walk-sum is valid for systems presenting long-range interactions and in any geometry. We illustrate the method by means of two physical systems.

[{'version': 'v1', 'created': 'Mon, 23 Apr 2012 15:34:42 GMT'} {'version': 'v2', 'created': 'Tue, 15 Apr 2014 06:59:58 GMT'}]

2014-04-16

[array(['Giscard', 'Pierre-Louis', ''], dtype=object) array(['Kiffner', 'Martin', ''], dtype=object) array(['Jaksch', 'Dieter', ''], dtype=object)]

2207.13657

Ben Heuer

Ben Heuer

A geometric $p$-adic Simpson correspondence in rank one

Improved results in section 2 on rigid groups, removed appendix B. arXiv admin note: text overlap with arXiv:2103.16557

math.AG

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

For any smooth proper rigid space $X$ over a complete algebraically closed extension $K$ of $\mathbb Q_p$ we give a geometrisation of the $p$-adic Simpson correspondence of rank one in terms of analytic moduli spaces: The $p$-adic character variety is canonically an \'etale twist of the moduli space of topological torsion Higgs line bundles over the Hitchin base. This also eliminates the choice of an exponential. The key idea is to relate both sides to moduli spaces of $v$-line bundles: We develop a theory of topological torsion subsheaves of $v$-sheaves and apply this to the diamantine $v$-Picard functor of arXiv:2103.16557. As an application of this geometric correspondence, we study a major open question in $p$-adic non-abelian Hodge theory raised by Faltings, namely which Higgs bundles will correspond to continuous representations under the $p$-adic Simpson correspondence. We answer this question in rank one by describing the essential image of the continuous characters $\pi^{\acute{e}t}_1(X)\to K^\times$ in terms of moduli spaces: For projective $X$ over $K=\mathbb C_p$, it is given by Higgs line bundles with vanishing Chern classes like in complex geometry, but in general we show that the correct condition is the strictly stronger assumption that the underlying line bundle is a topological torsion element in the topological group $\mathrm{Pic}(X)$.

[{'version': 'v1', 'created': 'Wed, 27 Jul 2022 17:23:51 GMT'} {'version': 'v2', 'created': 'Sun, 4 Dec 2022 15:55:54 GMT'}]

2022-12-06

[array(['Heuer', 'Ben', ''], dtype=object)]

2206.04305

Arun Baby

Arun Baby, Saranya Vinnaitherthan, Akhil Kerhalkar, Pranav Jawale, Sharath Adavanne, Nagaraj Adiga

Context-based out-of-vocabulary word recovery for ASR systems in Indian languages

12 pages

eess.AS cs.CL cs.SD

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

Detecting and recovering out-of-vocabulary (OOV) words is always challenging for Automatic Speech Recognition (ASR) systems. Many existing methods focus on modeling OOV words by modifying acoustic and language models and integrating context words cleverly into models. To train such complex models, we need a large amount of data with context words, additional training time, and increased model size. However, after getting the ASR transcription to recover context-based OOV words, the post-processing method has not been explored much. In this work, we propose a post-processing technique to improve the performance of context-based OOV recovery. We created an acoustically boosted language model with a sub-graph made at phone level with an OOV words list. We proposed two methods to determine a suitable cost function to retrieve the OOV words based on the context. The cost function is defined based on phonetic and acoustic knowledge for matching and recovering the correct context words in the decode. The effectiveness of the proposed cost function is evaluated at both word-level and sentence-level. The evaluation results show that this approach can recover an average of 50% context-based OOV words across multiple categories.

[{'version': 'v1', 'created': 'Thu, 9 Jun 2022 06:51:31 GMT'}]

2022-06-10

[array(['Baby', 'Arun', ''], dtype=object) array(['Vinnaitherthan', 'Saranya', ''], dtype=object) array(['Kerhalkar', 'Akhil', ''], dtype=object) array(['Jawale', 'Pranav', ''], dtype=object) array(['Adavanne', 'Sharath', ''], dtype=object) array(['Adiga', 'Nagaraj', ''], dtype=object)]

2210.08976

Tobias Wenzel

Tobias Wenzel

Global technology access in biolabs -- from DIY trend to an open source transformation

PLoS Biol 21(1): e3001931 (2023)

10.1371/journal.pbio.3001931

cs.CY cs.AR q-bio.OT

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

This article illustrates how open hardware solutions are implemented by researchers as a strategy to access technology for cutting-edge research. Specifically, it is discussed what kind of open technologies are most enabling in scientific environments characterized by economic and infrastructural constraints. It is demonstrated that do-it-yourself (DIY) technologies are already wide spread, in particular in countries with lower science funding, which in turn is the basis for the development of open technologies. Beyond financial accessibility, open hardware can be transformational to the technology access of laboratories through advantages in local production and direct knowledge transfer. Central drivers of the adoption of appropriate technologies in biolabs globally are open sharing, digital fabrication, local production, standard parts use, and detailed documentation.

[{'version': 'v1', 'created': 'Fri, 30 Sep 2022 16:34:27 GMT'}]

2023-01-19

[array(['Wenzel', 'Tobias', ''], dtype=object)]

1809.06574

Kapil Ahuja

Navneet Pratap Singh, Kapil Ahuja

Preconditioned Linear Solves for Parametric Model Order Reduction

15 Pages, 5 Tables

math.NA

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

The main computational cost of algorithms for computing reduced-order models of parametric dynamical systems is in solving sequences of very large and sparse linear systems. We focus on efficiently solving these linear systems, arising while reducing second-order linear dynamical systems, by iterative methods with appropriate preconditioners. We propose that the choice of underlying iterative solver is problem dependent. We propose the use of block variant of the underlying iterative method because often all right-hand-side are available together. Since, Sparse Approximate Inverse (SPAI) preconditioner is a general preconditioner that can be naturally parallelized, we propose its use. Our most novel contribution is a technique to cheaply update the SPAI preconditioner, while solving the parametrically changing linear systems. We support our proposed theory by numerical experiments where we first show benefit of 80% in time by using a block iterative method, and a benefit of 70% in time by using SPAI updates.

[{'version': 'v1', 'created': 'Tue, 18 Sep 2018 07:57:09 GMT'}]

2018-09-19

[array(['Singh', 'Navneet Pratap', ''], dtype=object) array(['Ahuja', 'Kapil', ''], dtype=object)]

gr-qc/9504036

John Baez

John C. Baez

Spin Networks in Nonperturbative Quantum Gravity

41 pages in LaTeX

in The Interface of Knots and Physics, ed. Louis Kauffman, A.M.S., Providence, 1996, pp. 167-203

gr-qc

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

A spin network is a generalization of a knot or link: a graph embedded in space, with edges labelled by representations of a Lie group, and vertices labelled by intertwining operators. Such objects play an important role in 3-dimensional topological quantum field theory, functional integration on the space A/G of connections modulo gauge transformations, and the loop representation of quantum gravity. Here, after an introduction to the basic ideas of nonperturbative canonical quantum gravity, we review a rigorous approach to functional integration on A/G in which L^2(A/G) is spanned by states labelled by spin networks. Then we explain the `new variables' for general relativity in 4-dimensional spacetime and describe how canonical quantization of gravity in this formalism leads to interesting applications of these spin network states.

[{'version': 'v1', 'created': 'Fri, 21 Apr 1995 19:03:28 GMT'} {'version': 'v2', 'created': 'Sat, 24 Jul 2010 05:07:13 GMT'}]

2010-07-27

[array(['Baez', 'John C.', ''], dtype=object)]

1609.01923

Paolo Benincasa

Paolo Benincasa, David Gordo

On-shell diagrams and the geometry of planar N < 4 SYM theories

34 pages, 65 figures

10.1007/JHEP11(2017)192

hep-th

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

We continue the discussion of the decorated on-shell diagrammatics for planar N < 4 Supersymmetric Yang-Mills theories started in arXiv:1510.03642. In particular, we focus on its relation with the structure of varieties on the Grassmannian. The decoration of the on-shell diagrams, which physically keeps tracks of the helicity of the coherent states propagating along their edges, defines new on-shell functions on the Grassmannian and can introduce novel higher-order singularities, which graphically are reflected into the presence of helicity loops in the diagrams. These new structures turn out to have similar features as in the non-planar case: the related higher-codimension varieties are identified by either the vanishing of one (or more) Plucker coordinates involving at least two non-adjacent columns, or new relations among Plucker coordinates. A distinctive feature is that the functions living on these higher-codimenson varieties can be thought of distributionally as having support on derivative delta-functions. After a general discussion, we explore in some detail the structures of the on-shell functions on Gr(2,4) and Gr(3,6) on which the residue theorem allows to obtain a plethora of identities among them.

[{'version': 'v1', 'created': 'Wed, 7 Sep 2016 10:34:34 GMT'}]

2018-01-17

[array(['Benincasa', 'Paolo', ''], dtype=object) array(['Gordo', 'David', ''], dtype=object)]

1703.08688

Federica Govoni

F. Govoni, M. Murgia, V. Vacca, F. Loi, M. Girardi, F. Gastaldello, G. Giovannini, L. Feretti, R. Paladino, E. Carretti, R. Concu, A. Melis, S. Poppi, G. Valente, G. Bernardi, A. Bonafede, W. Boschin, M. Brienza, T.E. Clarke, S. Colafrancesco, F. de Gasperin, D. Eckert, T.A. Ensslin, C. Ferrari, L. Gregorini, M. Johnston-Hollitt, H. Junklewitz, E. Orru', P. Parma, R. Perley, M. Rossetti, G.B Taylor, F. Vazza

Sardinia Radio Telescope observations of Abell 194 - the intra-cluster magnetic field power spectrum

Accepted by Astronomy and Astrophysics, 29 pages, 15 figures. Abstract abridged. A pdf version with high-quality figures can be downloaded from http://erg.oa-cagliari.inaf.it/preprints/a194_paper.pdf

A&A 603, A122 (2017)

10.1051/0004-6361/201630349

astro-ph.CO astro-ph.GA

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

We study the intra-cluster magnetic field in the poor galaxy cluster Abell 194 by complementing radio data, at different frequencies, with data in the optical and X-ray bands. We analyze new total intensity and polarization observations of Abell 194 obtained with the Sardinia Radio Telescope (SRT). We use the SRT data in combination with archival Very Large Array observations to derive both the spectral aging and Rotation Measure (RM) images of the radio galaxies 3C40A and 3C40B embedded in Abell 194. The optical analysis indicates that Abell 194 does not show a major and recent cluster merger, but rather agrees with a scenario of accretion of small groups. Under the minimum energy assumption, the lifetimes of synchrotron electrons in 3C40B measured from the spectral break are found to be 157 Myrs. The break frequency image and the electron density profile inferred from the X-ray emission are used in combination with the RM data to constrain the intra-cluster magnetic field power spectrum. By assuming a Kolmogorov power law power spectrum, we find that the RM data in Abell 194 are well described by a magnetic field with a maximum scale of fluctuations of Lambda_max=64 kpc and a central magnetic field strength of <B0>=1.5 microG. Further out, the field decreases with the radius following the gas density to the power of eta=1.1. Comparing Abell 194 with a small sample of galaxy clusters, there is a hint of a trend between central electron densities and magnetic field strengths.

[{'version': 'v1', 'created': 'Sat, 25 Mar 2017 13:03:17 GMT'}]

2017-07-19

[array(['Govoni', 'F.', ''], dtype=object) array(['Murgia', 'M.', ''], dtype=object) array(['Vacca', 'V.', ''], dtype=object) array(['Loi', 'F.', ''], dtype=object) array(['Girardi', 'M.', ''], dtype=object) array(['Gastaldello', 'F.', ''], dtype=object) array(['Giovannini', 'G.', ''], dtype=object) array(['Feretti', 'L.', ''], dtype=object) array(['Paladino', 'R.', ''], dtype=object) array(['Carretti', 'E.', ''], dtype=object) array(['Concu', 'R.', ''], dtype=object) array(['Melis', 'A.', ''], dtype=object) array(['Poppi', 'S.', ''], dtype=object) array(['Valente', 'G.', ''], dtype=object) array(['Bernardi', 'G.', ''], dtype=object) array(['Bonafede', 'A.', ''], dtype=object) array(['Boschin', 'W.', ''], dtype=object) array(['Brienza', 'M.', ''], dtype=object) array(['Clarke', 'T. E.', ''], dtype=object) array(['Colafrancesco', 'S.', ''], dtype=object) array(['de Gasperin', 'F.', ''], dtype=object) array(['Eckert', 'D.', ''], dtype=object) array(['Ensslin', 'T. A.', ''], dtype=object) array(['Ferrari', 'C.', ''], dtype=object) array(['Gregorini', 'L.', ''], dtype=object) array(['Johnston-Hollitt', 'M.', ''], dtype=object) array(['Junklewitz', 'H.', ''], dtype=object) array(["Orru'", 'E.', ''], dtype=object) array(['Parma', 'P.', ''], dtype=object) array(['Perley', 'R.', ''], dtype=object) array(['Rossetti', 'M.', ''], dtype=object) array(['Taylor', 'G. B', ''], dtype=object) array(['Vazza', 'F.', ''], dtype=object)]

astro-ph/0303424

Wolfram Freudling

Wolfram Freudling, Michael R. Corbin, Kirk T. Korista

Iron Emission in z~6 QSOs

13 pages, 3 figures, accepted for publication in ApJ Letters

Astrophys.J. 587 (2003) L67-L70

10.1086/375338

astro-ph

We have obtained low-resolution near infrared spectra of three QSOs at 5.7 < z < 6.3 using the NICMOS instrument of the Hubble Space Telescope. The spectra cover the rest-frame ultraviolet emission of the objects between lambda_rest ~ 1600A - 2800A. The Fe II emission-line complex at 2500A is clearly detected in two of the objects, and possibly detected in the third. The strength of this complex and the ratio of its integrated flux to that of Mg II lambda 2800 are comparable to values measured for QSOs at lower redshifts, and are consistent with Fe/Mg abundance ratios near or above the solar value. There thus appears to be no evolution of QSO metallicity to z~6. Our results suggest that massive, chemically enriched galaxies formed within 1 Gyr of the Big Bang. If this chemical enrichment was produced by Type Ia supernovae, then the progenitor stars formed at z ~ 20 +/- 10, in agreement with recent estimates based on the cosmic microwave background. These results also support models of an evolutionary link between star formation, the growth of supermassive black holes and nuclear activity.

[{'version': 'v1', 'created': 'Tue, 18 Mar 2003 20:27:14 GMT'}]

2009-11-07

[array(['Freudling', 'Wolfram', ''], dtype=object) array(['Corbin', 'Michael R.', ''], dtype=object) array(['Korista', 'Kirk T.', ''], dtype=object)]

1609.00557

Ludger Santen

Ines Weber, C\'ecile Appert-Rolland, Gr\'egory Schehr and Ludger Santen

Non-equilibrium fluctuations of a semi-flexible filament driven by active cross-linkers

9 pages, 5 figures

EPL 120 (2017) 38006

10.1209/0295-5075/120/38006

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

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

The cytoskeleton is an inhomogeneous network of semi-flexible filaments, which are involved in a wide variety of active biological processes. Although the cytoskeletal filaments can be very stiff and embedded in a dense and cross-linked network, it has been shown that, in cells, they typically exhibit significant bending on all length scales. In this work we propose a model of a semi-flexible filament deformed by different types of cross-linkers for which one can compute and investigate the bending spectrum. Our model allows to couple the evolution of the deformation of the semi-flexible polymer with the stochastic dynamics of linkers which exert transversal forces onto the filament. We observe a $q^{-2}$ dependence of the bending spectrum for some biologically relevant parameters and in a certain range of wavenumbers $q$. However, generically, the spatially localized forcing and the non-thermal dynamics both introduce deviations from the thermal-like $q^{-2}$ spectrum.

[{'version': 'v1', 'created': 'Fri, 2 Sep 2016 11:43:14 GMT'}]

2019-05-24

[array(['Weber', 'Ines', ''], dtype=object) array(['Appert-Rolland', 'Cécile', ''], dtype=object) array(['Schehr', 'Grégory', ''], dtype=object) array(['Santen', 'Ludger', ''], dtype=object)]

1712.09944

Niladribihari Sahoo

Niladribihari Sahoo (on behalf of the CMS Collaboration)

Rare $B$ decays at CMS

Proceeding of the CKM 2016 conference, TIFR, Mumbai

hep-ex

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

The Flavor Changing Neutral Current mediated decays $B \rightarrow \mu^{+}\mu^{-}$ and $B^{0} \rightarrow K^{*0}\mu^{+}\mu^{-}$ provide high sensitivity to new physics contributions. Sensitive observables include the branching fraction, the muon forward-backward asymmetry, the fraction of $K^{*0}$ longitudinal polarisation and the differential branching fraction. We report herein the recent results from CMS on these decay modes.

[{'version': 'v1', 'created': 'Thu, 28 Dec 2017 17:23:15 GMT'}]

2017-12-29

[array(['Sahoo', 'Niladribihari', '', 'on behalf of the CMS Collaboration'], dtype=object) ]

hep-ex/0008009

Alan J. Flavell

G. J. McCance

Event Shapes and Power Correction Results from HERA

Presented at QCD and High Energy Hadronic Interactions Rencontres de Moriond 2000

GLAS-PPE/2000-05

hep-ex

Inclusive event shape variables have been measured in the Breit Frame for neutral current deep-inelastic positron-proton scattering using the H1 and ZEUS detectors at HERA. The variables thrust, jet broadening, C-parameter, jet mass and two kinds of differential two-jet rate have been studied in the kinematic range 7 < Q < 100 GeV. The Q dependence of the shape variables have been compared with QCD applying power corrections proportional to 1/Q^p to account for hadronisation effects. The concept of power corrections is tested by fitting the strong coupling constant alpha_s and a non-perturbative parameter alpha(p-1)_bar.

[{'version': 'v1', 'created': 'Fri, 4 Aug 2000 22:05:34 GMT'}]

2007-05-23

[array(['McCance', 'G. J.', ''], dtype=object)]

2109.14807

Beibei Wang

Hong Deng and Yang Liu and Beibei Wang and Jian Yang and Lei Ma and Nicolas Holzschuch and Ling-Qi Yan

Constant-Cost Spatio-Angular Prefiltering of Glinty Appearance Using Tensor Decomposition

cs.GR

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

The detailed glinty appearance from complex surface microstructures enhances the level of realism, but is both space- and time-consuming to render, especially when viewed from far away (large spatial coverage) and/or illuminated by area lights (large angular coverage). In this paper, we formulate the glinty appearance rendering process as a spatio-angular range query problem of the Normal Distribution Functions (NDFs), and introduce an efficient spatio-angular prefiltering solution to it. We start by exhaustively precomputing all possible NDFs with differently sized positional coverages. Then we compress the precomputed data using tensor rank decomposition, which enables accurate and fast angular range queries. With our spatio-angular prefiltering scheme, we are able to solve both the storage and performance issues at the same time, leading to efficient rendering of glinty appearance with both constant storage and constant performance, regardless of the range of spatio-angular queries. Finally, we demonstrate that our method easily applies to practical rendering applications that were traditionally considered difficult. For example, efficient bidirectional reflection distribution function (BRDF) evaluation accurate NDF importance sampling, fast global illumination between glinty objects, high-frequency preserving rendering with environment lighting, and tile-based synthesis of glinty appearance.

[{'version': 'v1', 'created': 'Thu, 30 Sep 2021 02:14:38 GMT'}]

2021-10-01

[array(['Deng', 'Hong', ''], dtype=object) array(['Liu', 'Yang', ''], dtype=object) array(['Wang', 'Beibei', ''], dtype=object) array(['Yang', 'Jian', ''], dtype=object) array(['Ma', 'Lei', ''], dtype=object) array(['Holzschuch', 'Nicolas', ''], dtype=object) array(['Yan', 'Ling-Qi', ''], dtype=object)]

1304.5756

Kevin J. Black

Kevin J. Black (1 and 2), Jonathan M. Koller (1), Brad D. Miller (1) ((1) Department of Psychiatry, Washington University in St. Louis, (2) Departments of Neurology, Radiology and Anatomy & Neurobiology, Washington University in St. Louis)

Rapid quantitative pharmacodynamic imaging by a novel method: theory, simulation testing and proof of principle

26 pages total, 4 tables, 10 figures. The original PDF file at https://peerj.com/articles/117/ includes active hyperlinks. This version is the final published version. (Differs from v2 only in that I corrected the abstract on the arXiv.org page.)

PeerJ 1:e117, 2013

10.7717/peerj.117

q-bio.QM

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

Pharmacological challenge imaging has mapped, but rarely quantified, the sensitivity of a biological system to a given drug. We describe a novel method called rapid quantitative pharmacodynamic imaging. This method combines pharmacokinetic-pharmacodynamic modeling, repeated small doses of a challenge drug over a short time scale, and functional imaging to rapidly provide quantitative estimates of drug sensitivity including EC50 (the concentration of drug that produces half the maximum possible effect). We first test the method with simulated data, assuming a typical sigmoidal dose-response curve and assuming imperfect imaging that includes artifactual baseline signal drift and random error. With these few assumptions, rapid quantitative pharmacodynamic imaging reliably estimates EC50 from the simulated data, except when noise overwhelms the drug effect or when the effect occurs only at high doses. In preliminary fMRI studies of primate brain using a dopamine agonist, the observed noise level is modest compared with observed drug effects, and a quantitative EC50 can be obtained from some regional time-signal curves. Taken together, these results suggest that research and clinical applications for rapid quantitative pharmacodynamic imaging are realistic.

[{'version': 'v1', 'created': 'Sun, 21 Apr 2013 15:53:05 GMT'} {'version': 'v2', 'created': 'Wed, 7 May 2014 17:41:37 GMT'} {'version': 'v3', 'created': 'Tue, 27 May 2014 00:44:24 GMT'}]

2014-05-28

[array(['Black', 'Kevin J.', '', '1 and 2'], dtype=object) array(['Koller', 'Jonathan M.', ''], dtype=object) array(['Miller', 'Brad D.', ''], dtype=object)]

1901.06875

Ryo Matsumoto

Ryo Matsumoto, Peng Song, Shintaro Adachi, Yoshito Saito, Hiroshi Hara, Kazuki Nakamura, Sayaka Yamamoto, Hiromi Tanaka, Tetsuo Irifune, Hiroyuki Takeya, Yoshihiko Takano

Pressure-induced Superconductivity in Tin Sulfide

Phys. Rev. B 99, 184502 (2019)

10.1103/PhysRevB.99.184502

cond-mat.supr-con

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

Tin sulfide (SnS) was successfully synthesized in single crystals by a melt and slow-cooling method. The obtained sample was characterized by an X-ray diffraction, an energy dispersive spectrometry, and an X-ray photoelectron spectroscopy. Electrical transport properties in SnS were investigated under high pressure using a diamond anvil cell with boron-doped metallic diamond electrodes and undoped diamond insulating layer. We successfully observed an insulator to metal transition from 12.5 GPa and pressure-induced superconductivity at 5.8 K under 47.8 GPa as predicted by a theoretical calculation.

[{'version': 'v1', 'created': 'Mon, 21 Jan 2019 11:01:58 GMT'}]

2019-05-15

[array(['Matsumoto', 'Ryo', ''], dtype=object) array(['Song', 'Peng', ''], dtype=object) array(['Adachi', 'Shintaro', ''], dtype=object) array(['Saito', 'Yoshito', ''], dtype=object) array(['Hara', 'Hiroshi', ''], dtype=object) array(['Nakamura', 'Kazuki', ''], dtype=object) array(['Yamamoto', 'Sayaka', ''], dtype=object) array(['Tanaka', 'Hiromi', ''], dtype=object) array(['Irifune', 'Tetsuo', ''], dtype=object) array(['Takeya', 'Hiroyuki', ''], dtype=object) array(['Takano', 'Yoshihiko', ''], dtype=object)]

cs/0702032

Reid Andersen

Reid Andersen

Finding large and small dense subgraphs

12 pages, no figures

cs.DS

We consider two optimization problems related to finding dense subgraphs. The densest at-least-k-subgraph problem (DalkS) is to find an induced subgraph of highest average degree among all subgraphs with at least k vertices, and the densest at-most-k-subgraph problem (DamkS) is defined similarly. These problems are related to the well-known densest k-subgraph problem (DkS), which is to find the densest subgraph on exactly k vertices. We show that DalkS can be approximated efficiently, while DamkS is nearly as hard to approximate as the densest k-subgraph problem.

[{'version': 'v1', 'created': 'Mon, 5 Feb 2007 19:29:38 GMT'}]

2007-05-23

[array(['Andersen', 'Reid', ''], dtype=object)]

cond-mat/0702096

Mario Basletic

Kazumi Maki, Mario Basletic, Bojana Korin-Hamzic, Silvia Tomic

Hidden symmetries in Bechgaard salt (TMTSF)2NO3

AMN-3 Satellite Meeting, NBT-QT 2007, New Zealand

cond-mat.str-el

Among known Bechgaard and Fabre salts (TMTSF)2NO3 is unique since it never becomes superconducting even under pressure. Also, though (TMTSF)2NO3 undergoes the spin density wave (SDW) transition, the low temperature transport is semimetallic and gapless. We propose: a) the absence of the superconductivity is due to the inverse symmetry breaking associated with the anion ordering at 45K; b) the SDW state below 9K should be unconventional as seen from the angle dependent magnetoresistance oscillation (AMRO); c) a new phase diagram for Bechgaard salts, where unconventional spin density wave (USDW) occupies the prominent space.

[{'version': 'v1', 'created': 'Mon, 5 Feb 2007 10:27:15 GMT'}]

2007-05-23

[array(['Maki', 'Kazumi', ''], dtype=object) array(['Basletic', 'Mario', ''], dtype=object) array(['Korin-Hamzic', 'Bojana', ''], dtype=object) array(['Tomic', 'Silvia', ''], dtype=object)]

1904.06883

Shuai Chen

Shuai Chen, Jinpeng Li, Chuanqi Yao, Wenbo Hou, Shuo Qin, Wenyao Jin, Xu Tang

DuBox: No-Prior Box Objection Detection via Residual Dual Scale Detectors

cs.CV

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

Traditional neural objection detection methods use multi-scale features that allow multiple detectors to perform detecting tasks independently and in parallel. At the same time, with the handling of the prior box, the algorithm's ability to deal with scale invariance is enhanced. However, too many prior boxes and independent detectors will increase the computational redundancy of the detection algorithm. In this study, we introduce Dubox, a new one-stage approach that detects the objects without prior box. Working with multi-scale features, the designed dual scale residual unit makes dual scale detectors no longer run independently. The second scale detector learns the residual of the first. Dubox has enhanced the capacity of heuristic-guided that can further enable the first scale detector to maximize the detection of small targets and the second to detect objects that cannot be identified by the first one. Besides, for each scale detector, with the new classification-regression progressive strapped loss makes our process not based on prior boxes. Integrating these strategies, our detection algorithm has achieved excellent performance in terms of speed and accuracy. Extensive experiments on the VOC, COCO object detection benchmark have confirmed the effectiveness of this algorithm.

[{'version': 'v1', 'created': 'Mon, 15 Apr 2019 07:32:08 GMT'} {'version': 'v2', 'created': 'Tue, 16 Apr 2019 05:37:49 GMT'}]

2019-04-17

[array(['Chen', 'Shuai', ''], dtype=object) array(['Li', 'Jinpeng', ''], dtype=object) array(['Yao', 'Chuanqi', ''], dtype=object) array(['Hou', 'Wenbo', ''], dtype=object) array(['Qin', 'Shuo', ''], dtype=object) array(['Jin', 'Wenyao', ''], dtype=object) array(['Tang', 'Xu', ''], dtype=object)]

1811.11566

Savas Ozkan

Bora Baydar, Savas Ozkan, Gozde Bozdagi Akar

Automatic Liver Segmentation with Adversarial Loss and Convolutional Neural Network

Technical Report(In Turkish)

cs.CV

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

Automatic segmentation of medical images is among most demanded works in the medical information field since it saves time of the experts in the field and avoids human error factors. In this work, a method based on Conditional Adversarial Networks and Fully Convolutional Networks is proposed for the automatic segmentation of the liver MRIs. The proposed method, without any post-processing, is achieved the second place in the SIU Liver Segmentation Challenge 2018, data of which is provided by Dokuz Eyl\"ul University. In this paper, some improvements for the post-processing step are also proposed and it is shown that with these additions, the method outperforms other baseline methods.

[{'version': 'v1', 'created': 'Wed, 28 Nov 2018 13:57:36 GMT'}]

2018-11-29

[array(['Baydar', 'Bora', ''], dtype=object) array(['Ozkan', 'Savas', ''], dtype=object) array(['Akar', 'Gozde Bozdagi', ''], dtype=object)]

1701.02479

Tobias Frederico

J. Carbonell, T. Frederico and V. A. Karmanov

Euclidean to Minkowski Bethe-Salpeter amplitude and observables

11 pages, 12 figures

10.1140/epjc/s10052-017-4616-0

hep-ph nucl-th

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

We propose a method to reconstruct the Bethe-Salpeter amplitude in Minkowski space given the Euclidean Bethe-Salpeter amplitude -- or alternatively the Light-Front wave function -- as input. The method is based on the numerical inversion of the Nakanishi integral representation and computing the corresponding weight function. This inversion procedure is, in general, rather unstable, and we propose several ways to considerably reduce the instabilities. In terms of the Nakanishi weight function, one can easily compute the BS amplitude, the LF wave function and the electromagnetic form factor. The latter ones are very stable in spite of residual instabilities in the weight function. This procedure allows both, to continue the Euclidean BS solution in the Minkowski space and to obtain a BS amplitude from a LF wave function.

[{'version': 'v1', 'created': 'Tue, 10 Jan 2017 08:53:49 GMT'}]

2017-03-08

[array(['Carbonell', 'J.', ''], dtype=object) array(['Frederico', 'T.', ''], dtype=object) array(['Karmanov', 'V. A.', ''], dtype=object)]

2110.00606

Ernst Paunzen

G. M\"osenlechner, E. Paunzen, I. Pelisoli, J. Seelig, S. Stidl, H.M. Maitzen

A Kepler K2 view of subdwarf A-type stars

11 pages, 11 figures, 3 tables, accepted for publication in Astronomy & Astrophysics

A&A 657, A27 (2022)

10.1051/0004-6361/202037789

astro-ph.SR

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

The spectroscopic class of subdwarf A-type (sdA) stars has come into focus in recent years because of their possible link to extremely low-mass white dwarfs, a rare class of objects resulting from binary evolution. Although most sdA stars are consistent with metal-poor halo main-sequence stars, the formation and evolution of a fraction of these stars are still matters of debate. The identification of photometric variability can help to put further constraints on the evolutionary status of sdA stars, in particular through the analysis of pulsations. Moreover, the binary ratio, which can be deduced from eclipsing binaries and ellipsoidal variables, is important as input for stellar models. In order to search for variability due to either binarity or pulsations in objects of the spectroscopic sdA class, we have extracted all available high precision light curves from the Kepler K2 mission. We have performed a thorough time series analysis on all available light curves, employing three different methods. Frequencies with a signal-to-noise ratio higher than four have been used for further analysis. From the 25 targets, 13 turned out to be variables of different kinds (i.e. classical pulsating stars, ellipsoidal and cataclysmic variables, eclipsing binaries, and rotationally induced variables). For the remaining 12 objects, a variability threshold was determined.

[{'version': 'v1', 'created': 'Fri, 1 Oct 2021 18:23:01 GMT'}]

2021-12-29

[array(['Mösenlechner', 'G.', ''], dtype=object) array(['Paunzen', 'E.', ''], dtype=object) array(['Pelisoli', 'I.', ''], dtype=object) array(['Seelig', 'J.', ''], dtype=object) array(['Stidl', 'S.', ''], dtype=object) array(['Maitzen', 'H. M.', ''], dtype=object)]

1302.0732

Gerardo A. Mendoza

Gerardo A. Mendoza

Complex b-manifolds

33 pages

math.AP

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

A complex $b$-structure on a manifold $\M$ with boundary is an involutive subbundle $\bT^{0,1}\M$ of the complexification of $\bT\M$ with the property that $\C\bT\M = \bT^{0,1}\M + \bar{\bT^{0,1}\M}$ as a direct sum; the interior of $\M$ is a complex manifold. The complex $b$-structure determines an elliptic complex of $b$-operators and induces a rich structure on the boundary of $\M$. We study the cohomology of the indicial complex of the $b$-Dolbeault complex.

[{'version': 'v1', 'created': 'Mon, 4 Feb 2013 15:54:45 GMT'}]

2013-02-05

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

cond-mat/0701078

Jay Gambetta

Jay Gambetta, W. A. Braff, A. Wallraff, S. M. Girvin, R. J. Schoelkopf

Protocols for optimal readout of qubits using a continuous quantum nondemolition measurement

12 pages, 6 figures

Phys. Rev. A 76, 012325 (2007)

10.1103/PhysRevA.76.012325

cond-mat.mes-hall cond-mat.supr-con quant-ph

We study how the spontaneous relaxation of a qubit affects a continuous quantum non-demolition measurement of the initial state of the qubit. Given some noisy measurement record $\Psi$, we seek an estimate of whether the qubit was initially in the ground or excited state. We investigate four different measurement protocols, three of which use a linear filter (with different weighting factors) and a fourth which uses a full non-linear filter that gives the theoretically optimal estimate of the initial state of the qubit. We find that relaxation of the qubit at rate $1/T_1$ strongly influences the fidelity of any measurement protocol. To avoid errors due to this decay, the measurement must be completed in a time that decrease linearly with the desired fidelity while maintaining an adequate signal to noise ratio. We find that for the non-linear filter the predicted fidelity, as expected, is always better than the linear filters and that the fidelity is a monotone increasing function of the measurement time. For example, to achieve a fidelity of 90%, the box car linear filter requires a signal to noise ratio of $\sim 30$ in a time $T_1$ whereas the non-linear filter only requires a signal to noise ratio of $\sim 18$.

[{'version': 'v1', 'created': 'Thu, 4 Jan 2007 16:58:19 GMT'} {'version': 'v2', 'created': 'Mon, 24 Dec 2007 16:07:14 GMT'}]

2009-11-13

[array(['Gambetta', 'Jay', ''], dtype=object) array(['Braff', 'W. A.', ''], dtype=object) array(['Wallraff', 'A.', ''], dtype=object) array(['Girvin', 'S. M.', ''], dtype=object) array(['Schoelkopf', 'R. J.', ''], dtype=object)]

2203.14230

Alexander Wood

Alexander A. Wood, Alastair Stacey, Andy M. Martin

DC Quantum Magnetometry Below the Ramsey Limit

5pgs main text, 10 pgs supplementary

Physical Review Applied 18, 054019 (2022)

10.1103/PhysRevApplied.18.054019

quant-ph

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

We demonstrate quantum sensing of dc magnetic fields that exceeds the sensitivity of conventional $T_2^\ast$-limited dc magnetometry by more than an order of magnitude. We used nitrogen-vacancy centers in a diamond rotating at periods comparable to the spin coherence time, and characterize the dependence of magnetic sensitivity on measurement time and rotation speed. Our method up-converts only the dc field of interest and preserves the quantum coherence of the sensor. These results definitively improve the sensitivity of a quantum magnetometer to dc fields, an important and useful addition to the quantum sensing toolbox.

[{'version': 'v1', 'created': 'Sun, 27 Mar 2022 07:32:53 GMT'}]

2022-11-11

[array(['Wood', 'Alexander A.', ''], dtype=object) array(['Stacey', 'Alastair', ''], dtype=object) array(['Martin', 'Andy M.', ''], dtype=object)]

astro-ph/9804121

Combes

F. Combes

The Role of Interactions and Mergers

12 pages, 1 figure, to be published in "Formation and Evolution of Galaxies", ed O. Le Fevre and S. Charlot, Les Houches Series, Springer Verlag (1998)

astro-ph

Galaxy evolution depends strongly on the environment. Dynamical interactions and subsequent evolution make galaxies more concentrated, with higher surface densities, and also trigger star-formation, which consumes the available cold gas. Already at z=0, a large variety of galaxy types are observed, with different evolution stages, from the unevolved gas rich dwarf irregulars, or low surface brightness galaxies, to early-type concentrated galaxies, with no remaining gas. The dynamical processes of galaxy interactions, including internal evolution, are reviewed and evidence is shown of much larger interaction/merging rate at high redshift.

[{'version': 'v1', 'created': 'Mon, 13 Apr 1998 15:45:35 GMT'}]

2016-08-30

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

1705.01034

Roger Casals

Roger Casals, Emmy Murphy

Differential algebra of cubic planar graphs

33 pages, 22 figures

math.CO math-ph math.GT math.MP math.SG

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

In this article we associate a combinatorial differential graded algebra to a cubic planar graph G. This algebra is defined combinatorially by counting binary sequences, which we introduce, and several explicit computations are provided. In addition, in the appendix by K. Sackel the F(q)-rational points of its graded augmentation variety are shown to coincide with (q+1)-colorings of the dual graph.

[{'version': 'v1', 'created': 'Tue, 2 May 2017 15:44:10 GMT'} {'version': 'v2', 'created': 'Wed, 3 May 2017 19:44:39 GMT'}]

2017-05-05

[array(['Casals', 'Roger', ''], dtype=object) array(['Murphy', 'Emmy', ''], dtype=object)]

1611.03047

Valentin Resseguier

Valentin Resseguier, Etienne Memin, Bertrand Chapron

Geophysical flows under location uncertainty, Part III: SQG and frontal dynamics under strong turbulence conditions

10.1080/03091929.2017.1312102

physics.ao-ph

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

Models under location uncertainty are derived assuming that a component of the velocity is uncorrelated in time. The material derivative is accordingly modified to include an advection correction, inhomogeneous and anisotropic diffusion terms and a multiplicative noise contribution. This change can be consitently applied to all fluid dynamics evolution laws. This paper continues to explore benefits of this framework and consequences of specific scaling assumptions. Starting from a Boussinesq model under location uncertainty, a model is developed to describe a mesoscale flow subject to a strong underlying submesoscale activity. As obtained, the geostrophic balance is modified and the Quasi-Geostrophic (QG) assumptions remarkably lead to a zero Potential Vorticity (PV). The ensuing Surface Quasi-Geostrophic (SQG) model provides a simple diagnosis of warm frontolysis and cold frontogenesis.

[{'version': 'v1', 'created': 'Wed, 9 Nov 2016 19:10:43 GMT'}]

2017-05-31

[array(['Resseguier', 'Valentin', ''], dtype=object) array(['Memin', 'Etienne', ''], dtype=object) array(['Chapron', 'Bertrand', ''], dtype=object)]

2305.04745

David Futschik

David Futschik, Kelvin Ritland, James Vecore, Sean Fanello, Sergio Orts-Escolano, Brian Curless, Daniel S\'ykora, Rohit Pandey

Controllable Light Diffusion for Portraits

CVPR 2023

cs.CV cs.GR

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

We introduce light diffusion, a novel method to improve lighting in portraits, softening harsh shadows and specular highlights while preserving overall scene illumination. Inspired by professional photographers' diffusers and scrims, our method softens lighting given only a single portrait photo. Previous portrait relighting approaches focus on changing the entire lighting environment, removing shadows (ignoring strong specular highlights), or removing shading entirely. In contrast, we propose a learning based method that allows us to control the amount of light diffusion and apply it on in-the-wild portraits. Additionally, we design a method to synthetically generate plausible external shadows with sub-surface scattering effects while conforming to the shape of the subject's face. Finally, we show how our approach can increase the robustness of higher level vision applications, such as albedo estimation, geometry estimation and semantic segmentation.

[{'version': 'v1', 'created': 'Mon, 8 May 2023 14:46:28 GMT'}]

2023-05-09

[array(['Futschik', 'David', ''], dtype=object) array(['Ritland', 'Kelvin', ''], dtype=object) array(['Vecore', 'James', ''], dtype=object) array(['Fanello', 'Sean', ''], dtype=object) array(['Orts-Escolano', 'Sergio', ''], dtype=object) array(['Curless', 'Brian', ''], dtype=object) array(['Sýkora', 'Daniel', ''], dtype=object) array(['Pandey', 'Rohit', ''], dtype=object)]

0801.0611

Joseph Rudnick

Rouzbeh Ghafouri, Joseph Rudnick and Robijn Bruinsma

The confinement free energies of non-ideal branched polymers and ideal unbranched polymers are the same

12 pages, no figures

10.1209/0295-5075/82/46003

cond-mat.stat-mech cond-mat.soft

We use the method of dimensional reduction to show that a branching polymer with excluded volume interaction confined between two flat plates has, in the thermodynamic limit, a confinement free energy and density profile that is the same as that of an ideal linear polymer with the same number of monomers and the same monomer-plate interaction potential. Condensation due to branching is exactly compensated by swelling due to excluded volume interaction.

[{'version': 'v1', 'created': 'Thu, 3 Jan 2008 22:18:10 GMT'}]

2009-11-13

[array(['Ghafouri', 'Rouzbeh', ''], dtype=object) array(['Rudnick', 'Joseph', ''], dtype=object) array(['Bruinsma', 'Robijn', ''], dtype=object)]

2209.08906

Savvas Karatsiolis

Savvas Karatsiolis, Andreas Kamilaris

A model-agnostic approach for generating Saliency Maps to explain inferred decisions of Deep Learning Models

cs.CV cs.LG

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

The widespread use of black-box AI models has raised the need for algorithms and methods that explain the decisions made by these models. In recent years, the AI research community is increasingly interested in models' explainability since black-box models take over more and more complicated and challenging tasks. Explainability becomes critical considering the dominance of deep learning techniques for a wide range of applications, including but not limited to computer vision. In the direction of understanding the inference process of deep learning models, many methods that provide human comprehensible evidence for the decisions of AI models have been developed, with the vast majority relying their operation on having access to the internal architecture and parameters of these models (e.g., the weights of neural networks). We propose a model-agnostic method for generating saliency maps that has access only to the output of the model and does not require additional information such as gradients. We use Differential Evolution (DE) to identify which image pixels are the most influential in a model's decision-making process and produce class activation maps (CAMs) whose quality is comparable to the quality of CAMs created with model-specific algorithms. DE-CAM achieves good performance without requiring access to the internal details of the model's architecture at the cost of more computational complexity.

[{'version': 'v1', 'created': 'Mon, 19 Sep 2022 10:28:37 GMT'} {'version': 'v2', 'created': 'Tue, 27 Sep 2022 17:07:59 GMT'}]

2022-09-28

[array(['Karatsiolis', 'Savvas', ''], dtype=object) array(['Kamilaris', 'Andreas', ''], dtype=object)]

1909.08104

Byron Tasseff

Byron Tasseff, Carleton Coffrin, Andreas W\"achter, Carl Laird

Exploring Benefits of Linear Solver Parallelism on Modern Nonlinear Optimization Applications

LA-UR-19-28981

math.OC

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

The advent of efficient interior point optimization methods has enabled the tractable solution of large-scale linear and nonlinear programming (NLP) problems. A prominent example of such a method is seen in Ipopt, a widely-used, open-source nonlinear optimization solver. Algorithmically, Ipopt depends on the use of a sparse symmetric indefinite linear system solver, which is heavily employed within the optimization of barrier subproblems. As such, the performance and reliability of Ipopt is dependent on the properties of the selected linear solver. Inspired by a trend in mathematical programming toward solving larger and more challenging NLPs, this work explores two core questions: first, how does the scalability of available linear solvers, many of which exhibit shared-memory parallelism, impact Ipopt performance; and second, does the best linear solver vary across NLP problem classes, including nonlinear network problems and problems constrained by partial differential equations? To better understand these properties, this paper first describes available open- and closed-source, serial and parallel linear solvers and the fundamental differences among them. Second, it introduces the coupling of a new open-source linear solver capable of heterogeneous parallelism over multi-core central processing units and graphics processing units. Third, it compares linear solvers using a variety of mathematical programming problems, including standard test problems for linear and nonlinear optimization, optimal power flow benchmarks, and scalable two- and three-dimensional partial differential equation and optimal control problems. Finally, linear solver recommendations are provided to maximize Ipopt performance across different application domains.

[{'version': 'v1', 'created': 'Tue, 17 Sep 2019 21:13:31 GMT'}]

2019-09-19

[array(['Tasseff', 'Byron', ''], dtype=object) array(['Coffrin', 'Carleton', ''], dtype=object) array(['Wächter', 'Andreas', ''], dtype=object) array(['Laird', 'Carl', ''], dtype=object)]

cond-mat/0201090

Oliver Waldmann

Oliver Waldmann (1), L. Zhao (2), L. K. Thompson (2) ((1) Physikalisches Institut III, Universit\"at Erlangen-N\"urnberg, (2) Department of Chemistry, Memorial University)

Field dependent anisotropy change in a supramolecular Mn(II)-[3x3] grid

4 pages, 4 figures, to be published in Phys. Rev. Lett

Phys. Rev. Lett. 88, 066401 (2002)

10.1103/PhysRevLett.88.066401

cond-mat

The magnetic anisotropy of a novel Mn(II)-[3x3] grid complex was investigated by means of high-field torque magnetometry. Torque vs. field curves at low temperatures demonstrate a ground state with S > 0 and exhibit a torque step due to a field induced level-crossing at B* \approx 7.5 T, accompanied by an abrupt change of magnetic anisotropy from easy-axis to hard-axis type. These observations are discussed in terms of a spin Hamiltonian formalism.

[{'version': 'v1', 'created': 'Tue, 8 Jan 2002 09:10:23 GMT'}]

2009-11-07

[array(['Waldmann', 'Oliver', ''], dtype=object) array(['Zhao', 'L.', ''], dtype=object) array(['Thompson', 'L. K.', ''], dtype=object)]

2105.01005

Emanuele Spadaro

Luca Di Fazio and Emanuele Spadaro

Regularity of solutions to nonlinear thin and boundary obstacle problems

math.AP

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

Variational inequalities with thin obstacles and Signorini-type boundary conditions are classical problems in the calculus of variations, arising in numerous applications. In the linear case many refined results are known, while in the nonlinear setting our understanding is still at a preliminary stage. In this paper we prove $C^1$ regularity for the solutions to a general class of quasi-linear variational inequalities with thin obstacles and $C^{1, \alpha}$ regularity for variational inequalities under Signorini-type conditions on the boundary of a domain.

[{'version': 'v1', 'created': 'Mon, 3 May 2021 16:51:53 GMT'}]

2021-05-04

[array(['Di Fazio', 'Luca', ''], dtype=object) array(['Spadaro', 'Emanuele', ''], dtype=object)]

2108.08101

Lawrence R. Pratt

L. R. Pratt, D. T. Gomez, A. Muralidharan, and N. Pesika

Shapes of Non-symmetric Capillary Bridges

6 pages, 7 figures

cond-mat.soft cond-mat.stat-mech

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

Here we study the shapes of droplets captured between chemically distinct parallel plates. This work is a preliminary step toward characterizing the influence of second-phase bridging between biomolecular surfaces on their solution contacts, i.e., capillary attraction or repulsion. We obtain a simple, variable-separated quadrature formula for the bridge shape. The technical complication of double-ended boundary conditions on the shapes of non-symmetric bridges is addressed by studying waists in the bridge shape, i.e., points where the bridge silhouette has zero derivative. Waists are always expected with symmetric bridges, but waist-points can serve to characterize shape segments in general cases. We study how waist possibilities depend on the physical input to these problems, noting that these formulae change with the sign of the inside-outside pressure difference of the bridge. These results permit a variety of different interesting shapes, and the development below is accompanied by several examples.

[{'version': 'v1', 'created': 'Wed, 18 Aug 2021 11:46:44 GMT'}]

2021-08-19

[array(['Pratt', 'L. R.', ''], dtype=object) array(['Gomez', 'D. T.', ''], dtype=object) array(['Muralidharan', 'A.', ''], dtype=object) array(['Pesika', 'N.', ''], dtype=object)]

1612.03231

Yongjun Zhu

Yongjun Zhu, Erjia Yan, Il-Yeol Song

A natural language interface to a graph-based bibliographic information retrieval system

cs.IR cs.CL

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

With the ever-increasing scientific literature, there is a need on a natural language interface to bibliographic information retrieval systems to retrieve related information effectively. In this paper, we propose a natural language interface, NLI-GIBIR, to a graph-based bibliographic information retrieval system. In designing NLI-GIBIR, we developed a novel framework that can be applicable to graph-based bibliographic information retrieval systems. Our framework integrates algorithms/heuristics for interpreting and analyzing natural language bibliographic queries. NLI-GIBIR allows users to search for a variety of bibliographic data through natural language. A series of text- and linguistic-based techniques are used to analyze and answer natural language queries, including tokenization, named entity recognition, and syntactic analysis. We find that our framework can effectively represents and addresses complex bibliographic information needs. Thus, the contributions of this paper are as follows: First, to our knowledge, it is the first attempt to propose a natural language interface to graph-based bibliographic information retrieval. Second, we propose a novel customized natural language processing framework that integrates a few original algorithms/heuristics for interpreting and analyzing natural language bibliographic queries. Third, we show that the proposed framework and natural language interface provide a practical solution in building real-world natural language interface-based bibliographic information retrieval systems. Our experimental results show that the presented system can correctly answer 39 out of 40 example natural language queries with varying lengths and complexities.

[{'version': 'v1', 'created': 'Sat, 10 Dec 2016 00:32:28 GMT'}]

2016-12-13

[array(['Zhu', 'Yongjun', ''], dtype=object) array(['Yan', 'Erjia', ''], dtype=object) array(['Song', 'Il-Yeol', ''], dtype=object)]

1510.07580

V Miranda

V Miranda, Wayne Hu, Chen He, Hayato Motohashi

Nonlinear Excitations in Inflationary Power Spectra

19 pages, 11 figures, submitted to PRD

Phys. Rev. D 93, 023504 (2016)

10.1103/PhysRevD.93.023504

astro-ph.CO

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

We develop methods to calculate the curvature power spectrum in models where features in the inflaton potential nonlinearly excite modes and generate high frequency features in the spectrum. The first nontrivial effect of excitations generating further excitations arises at third order in deviations from slow roll. If these further excitations are contemporaneous, the series can be resummed, showing the exponential sensitivity of the curvature spectrum to potential features. More generally, this exponential approximation provides a power spectrum template which nonlinearly obeys relations between excitation coefficients and whose parameters may be appropriately adjusted. For a large sharp step in the potential, it greatly improves the analytic power spectrum template and its dependence on potential parameters. For axionic oscillations in the potential, it corrects the mapping between the potential and the amplitude, phase and zero point of the curvature oscillations, which might otherwise cause erroneous inferences in for example the tensor-scalar ratio, formally even when that amplitude is $10^3$ times larger than the slow roll power spectrum. It also estimates when terms that produce double frequency oscillations that are usually omitted when analyzing data should be included. These techniques should allow future studies of high frequency features in the CMB and large scale structure to extend to higher amplitude and/or higher precision.

[{'version': 'v1', 'created': 'Mon, 26 Oct 2015 18:23:06 GMT'}]

2018-09-18

[array(['Miranda', 'V', ''], dtype=object) array(['Hu', 'Wayne', ''], dtype=object) array(['He', 'Chen', ''], dtype=object) array(['Motohashi', 'Hayato', ''], dtype=object)]

0810.1302

Ran Zhou

Ran Zhou, Thomas Blum, Takumi Doi, Masashi Hayakawa, Taku Izubuchi, Norikazu Yamada

Isospin symmetry breaking effects in the pion and nucleon masses

Talk given at The XXVI International Symposium on Lattice Field Theory, LATTICE 2008 - Williamsburg, Virginia, USA. July 14 - 19, 2008

PoS LATTICE2008:131,2008

hep-lat

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

We investigate the electromagnetic mass splittings in the pseudoscalar meson and nucleon systems by combining 2+1 flavor domain wall fermion gauge configurations, generated by the RBC and UKQCD collaborations, and quenched, non-compact, lattice QED configurations. We analyze finite volume effects by using $16^3\times 32$ and $24^3\times 64$ lattices.

[{'version': 'v1', 'created': 'Tue, 7 Oct 2008 21:29:21 GMT'}]

2010-01-21

[array(['Zhou', 'Ran', ''], dtype=object) array(['Blum', 'Thomas', ''], dtype=object) array(['Doi', 'Takumi', ''], dtype=object) array(['Hayakawa', 'Masashi', ''], dtype=object) array(['Izubuchi', 'Taku', ''], dtype=object) array(['Yamada', 'Norikazu', ''], dtype=object)]

1903.03446

Stuart Reeves

Stuart Reeves, Jordan Beck

Talking about interaction*

10.1016/j.ijhcs.2019.05.010

cs.HC

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

Recent research has exposed disagreements over the nature and usefulness of what may (or may not) be Human-Computer Interaction's fundamental phenomenon: 'interaction'. For some, HCI's theorising about interaction has been deficient, impacting its capacity to inform decisions in design, suggesting the need either to perform first-principles definition work or broader administrative clarification and formalisation of the multitude of formulations of the concepts of interaction and their particular uses. For others, there remain open questions over the continued relevance of certain 'versions' of interaction as a useful concept in HCI at all. We pursue a different perspective in this paper, reviewing how HCI treats interaction through examining its 'conceptual pragmatics' within HCI's discourse. We argue that articulations of the concepts of interaction can be a site of productive conflict for HCI that for many reasons may resist attempts of formalisation as well as attempts to dispense with them. The main contribution of this paper is in specifying how we might go about talking of interaction and the value of interaction language as promiscuous concepts.

[{'version': 'v1', 'created': 'Fri, 8 Mar 2019 13:53:21 GMT'} {'version': 'v2', 'created': 'Sun, 5 May 2019 13:45:35 GMT'} {'version': 'v3', 'created': 'Tue, 28 May 2019 15:08:43 GMT'}]

2019-06-03

[array(['Reeves', 'Stuart', ''], dtype=object) array(['Beck', 'Jordan', ''], dtype=object)]

1903.00843

Xiang Liu

Xiang Liu, Ziyang Tang, Huyunting Huang, Tonglin Zhang, Baijian Yang

Multiple Learning for Regression in big data

8 pages

cs.LG cs.DC stat.ML

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

Regression problems that have closed-form solutions are well understood and can be easily implemented when the dataset is small enough to be all loaded into the RAM. Challenges arise when data is too big to be stored in RAM to compute the closed form solutions. Many techniques were proposed to overcome or alleviate the memory barrier problem but the solutions are often local optimal. In addition, most approaches require accessing the raw data again when updating the models. Parallel computing clusters are also expected if multiple models need to be computed simultaneously. We propose multiple learning approaches that utilize an array of sufficient statistics (SS) to address this big data challenge. This memory oblivious approach breaks the memory barrier when computing regressions with closed-form solutions, including but not limited to linear regression, weighted linear regression, linear regression with Box-Cox transformation (Box-Cox regression) and ridge regression models. The computation and update of the SS array can be handled at per row level or per mini-batch level. And updating a model is as easy as matrix addition and subtraction. Furthermore, multiple SS arrays for different models can be easily computed simultaneously to obtain multiple models at one pass through the dataset. We implemented our approaches on Spark and evaluated over the simulated datasets. Results showed our approaches can achieve closed-form solutions of multiple models at the cost of half training time of the traditional methods for a single model.

[{'version': 'v1', 'created': 'Sun, 3 Mar 2019 06:34:24 GMT'} {'version': 'v2', 'created': 'Sat, 5 Oct 2019 00:39:30 GMT'}]

2019-10-08

[array(['Liu', 'Xiang', ''], dtype=object) array(['Tang', 'Ziyang', ''], dtype=object) array(['Huang', 'Huyunting', ''], dtype=object) array(['Zhang', 'Tonglin', ''], dtype=object) array(['Yang', 'Baijian', ''], dtype=object)]

2011.14146

Isa Inuwa-Dutse

Isa Inuwa-Dutse

Towards Combating Pandemic-related Misinformation in Social Media

13 pages, 5 figures

cs.SI cs.IR

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

Conventional preventive measures during pandemic include social distancing and lockdown. Such measures in the time of social media brought about a new set of challenges - vulnerability to the toxic impact of online misinformation is high. A case in point is the prevailing COVID-19; as the virus propagates, so does the associated misinformation and fake news about it leading to infodemic. Since the outbreak, there has been a surge of studies investigating various aspects of the pandemic. Of interest to this chapter include studies centring on datasets from online social media platforms where the bulk of the public discourse happen. Consequently, the main goal is to support the fight against negative infodemic by (1) contributing a diverse set of curated relevant datasets (2) recommending relevant areas to study using the datasets (3) discussion on how relevant datasets, strategies and state-of-the-art IT tools can be leveraged in managing the pandemic.

[{'version': 'v1', 'created': 'Sat, 28 Nov 2020 15:30:14 GMT'} {'version': 'v2', 'created': 'Mon, 15 Feb 2021 02:26:25 GMT'}]

2021-02-16

[array(['Inuwa-Dutse', 'Isa', ''], dtype=object)]

2305.19060

ALICE publications

ALICE Collaboration

Energy dependence of coherent photonuclear production of J/$\psi$ mesons in ultra-peripheral Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$=5.02 TeV

33 pages, 5 captioned figures, 5 tables, authors from page 28, submitted to JHEP, figures at http://alice-publications.web.cern.ch/node/9351

CERN-EP-2023-100

nucl-ex hep-ex

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

The cross section for coherent photonuclear production of J/$\psi$ is presented as a function of the electromagnetic dissociation (EMD) of Pb. The measurement is performed with the ALICE detector in ultra-peripheral Pb-Pb collisions at a centre-of-mass energy per nucleon pair of $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV. Cross sections are presented in five different J/$\psi$ rapidity ranges within $|y|<4$, with the J/$\psi$ reconstructed via its dilepton decay channels. In some events the J/$\psi$ is not accompanied by EMD, while other events do produce neutrons from EMD at beam rapidities either in one or the other beam direction, or in both. The cross sections in a given rapidity range and for different configurations of neutrons from EMD allow for the extraction of the energy dependence of this process in the range $17 < W_{\gamma\, \mathrm{Pb, n}} <920$ GeV, where $W_{\gamma\, \mathrm{Pb, n}}$ is the centre-of-mass energy per nucleon of the $\gamma\,\mathrm{Pb}$ system. This range corresponds to a Bjorken-$x$ interval spanning about three orders of magnitude: $ 1.1\times10^{-5}<x<3.3\times 10^{-2}$. In addition to the ultra-peripheral and photonuclear cross sections, the nuclear suppression factor is obtained. These measurements point to a strong depletion of the gluon distribution in Pb nuclei over a broad, previously unexplored, energy range. These results, together with previous ALICE measurements, provide unprecedented information to probe quantum chromodynamics at high energies.

[{'version': 'v1', 'created': 'Tue, 30 May 2023 14:22:38 GMT'}]

2023-05-31

[array(['ALICE Collaboration', '', ''], dtype=object)]

cond-mat/0103498

Joseph Rudnick

Roya Zandi and Joseph Rudnick (UCLA)

Constraints, Histones, and the 30 Nanometer Spiral

ReVTeX, 15 pages, 18 figures

10.1103/PhysRevE.64.051918

cond-mat.soft q-bio.BM

We investigate the mechanical stability of a segment of DNA wrapped around a histone in the nucleosome configuration. The assumption underlying this investigation is that the proper model for this packaging arrangement is that of an elastic rod that is free to twist and that writhes subject to mechanical constraints. We find that the number of constraints required to stabilize the nuclesome configuration is determined by the length of the segment, the number of times the DNA wraps around the histone spool, and the specific constraints utilized. While it can be shown that four constraints suffice, in principle, to insure stability of the nucleosome, a proper choice must be made to guarantee the effectiveness of this minimal number. The optimal choice of constraints appears to bear a relation to the existence of a spiral ridge on the surface of the histone octamer. The particular configuration that we investigate is related to the 30 nanometer spiral, a higher-order organization of DNA in chromatin.

[{'version': 'v1', 'created': 'Fri, 23 Mar 2001 18:01:34 GMT'} {'version': 'v2', 'created': 'Mon, 26 Mar 2001 18:58:27 GMT'}]

2009-11-07

[array(['Zandi', 'Roya', '', 'UCLA'], dtype=object) array(['Rudnick', 'Joseph', '', 'UCLA'], dtype=object)]

2108.00641

Moritz Stieneker

Moritz Stieneker and Leon Topp and Svetlana Gurevich and Andreas Heuer

Multiscale perspective on wetting on switchable substrates: mapping between microscopic and mesoscopic models

34 pages, 15 figures

physics.flu-dyn

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

To understand the non-equilibrium relaxation dynamics of a liquid droplet on a switchable substrate the interplay of different length- and time-scales needs to be understood. We present a method to map the microscopic information, resulting from a molecular dynamics simulation, to a mesoscopic scale, reflected by a thin film model. After a discussion of the mapping procedure we first analyze the relaxation of a liquid droplet upon switching the wettability of the substrate. Further, we show that a nearly identical mapping procedure can be used for the description of two coalescing droplets. With our procedure we take a first step to extend the mapping from the equilibrium case to non-equilibrium wetting dynamics, thus allowing for a quantitative multi-scale analysis.

[{'version': 'v1', 'created': 'Mon, 2 Aug 2021 05:20:27 GMT'} {'version': 'v2', 'created': 'Wed, 24 Nov 2021 12:47:23 GMT'} {'version': 'v3', 'created': 'Fri, 29 Jul 2022 12:59:53 GMT'}]

2022-08-01

[array(['Stieneker', 'Moritz', ''], dtype=object) array(['Topp', 'Leon', ''], dtype=object) array(['Gurevich', 'Svetlana', ''], dtype=object) array(['Heuer', 'Andreas', ''], dtype=object)]

2303.11862

Jean-Christophe Sibel

Vincent Corlay and Jean-Christophe Sibel

An MDP approach for radio resource allocation in urban Future Railway Mobile Communication System (FRMCS) scenarios

submitted to VTC-spring 2023

cs.IT math.IT

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

In the context of railway systems, the application performance can be very critical and the radio conditions not advantageous. Hence, the communication problem parameters include both a survival time stemming from the application layer and a channel error probability stemming from the PHY layer. This paper proposes to consider the framework of Markov Decision Process (MDP) to design a strategy for scheduling radio resources based on both application and PHY layer parameters. The MDP approach enables to obtain the optimal strategy via the value iteration algorithm. The performance of this algorithm can thus serve as a benchmark to assess lower complexity schedulers. We show numerical evaluations where we compare the value iteration algorithm with other schedulers, including one based on deep Q learning.

[{'version': 'v1', 'created': 'Tue, 21 Mar 2023 14:05:55 GMT'}]

2023-03-22

[array(['Corlay', 'Vincent', ''], dtype=object) array(['Sibel', 'Jean-Christophe', ''], dtype=object)]

1801.09648

Christopher Kauffman

Christopher Kauffman

Global Stability for Charged Scalar Fields in an Asymptotically Flat Metric in Harmonic Gauge

58 Pages, arguments streamlined and minor mistakes corrected

math.AP

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

We prove global stability for the Charge-Scalar Field system on a background spacetime which is close to $1+3$-dimensional Minkowski space and whose outward light cones converge to those for the Schwarzschild metric at null infinity. The key technique to this proof is the use of a modified null frame, depending only on the mass $M$ of the metric, which captures the asymptotic behavior of the metric at future null infinity. Our results are analogous to results obtained in Minkowski space by Lindblad and Sterbenz up to a change in coordinates, and will in the sequel be used to prove the full structure of the Einstein-Charge scalar field system in these modified harmonic coordinates.

[{'version': 'v1', 'created': 'Mon, 29 Jan 2018 17:50:08 GMT'} {'version': 'v2', 'created': 'Fri, 30 Aug 2019 18:28:36 GMT'} {'version': 'v3', 'created': 'Wed, 1 Sep 2021 15:24:28 GMT'}]

2021-09-02

[array(['Kauffman', 'Christopher', ''], dtype=object)]

1512.06185

Clara Fannjiang

Clara Fannjiang

Optimal Arrays for Compressed Sensing in Snapshot-Mode Radio Interferometry

Astronomy & Astrophysics, 559, A73 (2013)

10.1051/0004-6361/201321079

astro-ph.IM

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

Radio interferometry has always faced the problem of incomplete sampling of the Fourier plane. A possible remedy can be found in the promising new theory of compressed sensing (CS), which allows for the accurate recovery of sparse signals from sub-Nyquist sampling given certain measurement conditions. We provide an introductory assessment of optimal arrays for CS in snapshot-mode radio interferometry, using orthogonal matching pursuit (OMP), a widely used CS recovery algorithm similar in some respects to CLEAN. We focus on centrally condensed (specifically, Gaussian) arrays versus uniform arrays, and the principle of randomization versus deterministic arrays such as the VLA. The theory of CS is grounded in $a)$ sparse representation of signals and $b)$ measurement matrices of low coherence. We calculate a related quantity, mutual coherence (MC), as a theoretical indicator of arrays' suitability for OMP based on the recovery error bounds in (Donoho et al. 2006). OMP reconstructions of both point and extended objects are also run from simulated incomplete data. Optimal arrays are considered for object recovery through 1) the natural pixel representation and 2) the representation by the block discrete cosine transform (BDCT). We find that reconstructions of the pixel representation perform best with the uniform random array, while reconstructions of the BDCT representation perform best with normal random arrays. Slight randomization to the VLA also improves it hugely for CS with the pixel basis. In the pixel basis, array design for CS reflects known principles of array design for small numbers of antennas, namely of randomness and uniform distribution. Differing results with the BDCT, however, emphasize the importance of studying how sparsifying bases affect array design before CS can be optimized.

[{'version': 'v1', 'created': 'Sat, 19 Dec 2015 04:38:34 GMT'}]

2015-12-22

[array(['Fannjiang', 'Clara', ''], dtype=object)]

cond-mat/0511088

Luca Salasnich

A. Parola, L. Salasnich, R. Rota, and L. Reatto

Quantum Phases of Attractive Matter Waves in a Toroidal Trap

6 pages, 5 figures. To be published in Phys. Rev. A

Phys. Rev. A 72, 063612 (2005)

10.1103/PhysRevA.72.063612

cond-mat.other cond-mat.stat-mech

Investigating the quantum phase transition in a ring from a uniform attractive Bose-Einstein condensate to a localized bright soliton we find that the soliton undergoes transverse collapse at a critical interaction strength, which depends on the ring dimensions. In addition, we predict the existence of other soliton configurations with many peaks, showing that they have a limited stability domain. Finally, we show that the phase diagram displays several new features when the toroidal trap is set in rotation.

[{'version': 'v1', 'created': 'Thu, 3 Nov 2005 16:54:55 GMT'}]

2009-11-11

[array(['Parola', 'A.', ''], dtype=object) array(['Salasnich', 'L.', ''], dtype=object) array(['Rota', 'R.', ''], dtype=object) array(['Reatto', 'L.', ''], dtype=object)]

2105.08267

Tianchen Wang

Tianchen Wang, Zhihe Li, Meiping Huang, Jian Zhuang, Shanshan Bi, Jiawei Zhang, Yiyu Shi, Hongwen Fei, Xiaowei Xu

EchoCP: An Echocardiography Dataset in Contrast Transthoracic Echocardiography for Patent Foramen Ovale Diagnosis

MICCAI2021

eess.IV cs.CV

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

Patent foramen ovale (PFO) is a potential separation between the septum, primum and septum secundum located in the anterosuperior portion of the atrial septum. PFO is one of the main factors causing cryptogenic stroke which is the fifth leading cause of death in the United States. For PFO diagnosis, contrast transthoracic echocardiography (cTTE) is preferred as being a more robust method compared with others. However, the current PFO diagnosis through cTTE is extremely slow as it is proceeded manually by sonographers on echocardiography videos. Currently there is no publicly available dataset for this important topic in the community. In this paper, we present EchoCP, as the first echocardiography dataset in cTTE targeting PFO diagnosis. EchoCP consists of 30 patients with both rest and Valsalva maneuver videos which covers various PFO grades. We further establish an automated baseline method for PFO diagnosis based on the state-of-the-art cardiac chamber segmentation technique, which achieves 0.89 average mean Dice score, but only 0.60/0.67 mean accuracies for PFO diagnosis, leaving large room for improvement. We hope that the challenging EchoCP dataset can stimulate further research and lead to innovative and generic solutions that would have an impact in multiple domains. Our dataset is released.

[{'version': 'v1', 'created': 'Tue, 18 May 2021 04:24:53 GMT'} {'version': 'v2', 'created': 'Thu, 16 Sep 2021 01:27:12 GMT'}]

2021-09-17

[array(['Wang', 'Tianchen', ''], dtype=object) array(['Li', 'Zhihe', ''], dtype=object) array(['Huang', 'Meiping', ''], dtype=object) array(['Zhuang', 'Jian', ''], dtype=object) array(['Bi', 'Shanshan', ''], dtype=object) array(['Zhang', 'Jiawei', ''], dtype=object) array(['Shi', 'Yiyu', ''], dtype=object) array(['Fei', 'Hongwen', ''], dtype=object) array(['Xu', 'Xiaowei', ''], dtype=object)]

2012.02823

Matilde Marcolli

Matilde Marcolli and Roger Penrose

Gluing Noncommutative Twistor Spaces

42 pages, LaTeX

math-ph math.MP

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

We describe a general procedure, based on Gerstenhaber-Schack complexes, for extending to quantized twistor spaces the Donaldson-Friedman gluing of twistor spaces via deformation theory of singular spaces. We consider in particular various possible quantizations of twistor spaces that leave the underlying spacetime manifold classical, including the geometric quantization of twistor spaces originally constructed by the second author, as well as some variants based on noncommutative geometry. We discuss specific aspects of the gluing construction for these different quantization procedures.

[{'version': 'v1', 'created': 'Fri, 4 Dec 2020 19:56:12 GMT'}]

2020-12-08

[array(['Marcolli', 'Matilde', ''], dtype=object) array(['Penrose', 'Roger', ''], dtype=object)]

2002.11786

Cihan Bacaksiz

C. Bacaksiz, M. Yagmurcukardes, F. M. Peeters, and M. V. Milo\v{s}evi\'c

Hematite at its thinnest limit

10.1088/2053-1583/ab6d79

cond-mat.mes-hall

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

Motivated by the recent synthesis of two-dimensional $\alpha$-Fe$_2$O$_3$ [Balan $et$ $al.$ Nat. Nanotech. 13, 602 (2018)], we analyze the structural, vibrational, electronic and magnetic properties of single- and few-layer $\alpha$-Fe$_2$O$_3$ compared to bulk, by $ab-initio$ and Monte-Carlo simulations. We reveal how monolayer $\alpha$-Fe$_2$O$_3$ (hematene) can be distinguished from the few-layer structures, and how they all differ from bulk through observable Raman spectra. The optical spectra exhibit gradual shift of the prominent peak to higher energy, as well as additional features at lower energy when $\alpha$-Fe$_2$O$_3$ is thinned down to a monolayer. Both optical and electronic properties have strong spin asymmetry, meaning that lower-energy optical and electronic activities are allowed for the single-spin state. Finally, our considerations of magnetic properties reveal that 2D hematite has anti-ferromagnetic ground state for all thicknesses, but the critical temperature for Morin transition increases with decreasing sample thickness. On all accounts, the link to available experimental data is made, and further measurements are prompted.

[{'version': 'v1', 'created': 'Wed, 26 Feb 2020 20:45:47 GMT'}]

2020-02-28

[array(['Bacaksiz', 'C.', ''], dtype=object) array(['Yagmurcukardes', 'M.', ''], dtype=object) array(['Peeters', 'F. M.', ''], dtype=object) array(['Milošević', 'M. V.', ''], dtype=object)]

0811.3776

Krainer Thomas

Juan B. Gil, Thomas Krainer, Gerardo A. Mendoza

Trace expansions for elliptic cone operators with stationary domains

27 pages. Minor corrections and change of title

math.SP math.AP math.FA

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

We analyze the behavior of the trace of the resolvent of an elliptic cone differential operator as the spectral parameter tends to infinity. The resolvent splits into two components, one associated with the minimal extension of the operator, and another, of finite rank, depending on the particular choice of domain. We give a full asymptotic expansion of the first component and expand the component of finite rank in the case where the domain is stationary. The results make use, and develop further, our previous investigations on the analytic and geometric structure of the resolvent. The analysis of nonstationary domains, considerably more intricate, is pursued elsewhere.

[{'version': 'v1', 'created': 'Sun, 23 Nov 2008 22:18:51 GMT'} {'version': 'v2', 'created': 'Tue, 30 Jun 2009 21:49:49 GMT'}]

2009-07-01

[array(['Gil', 'Juan B.', ''], dtype=object) array(['Krainer', 'Thomas', ''], dtype=object) array(['Mendoza', 'Gerardo A.', ''], dtype=object)]