120834175
Beam test results of a resistive plate chamber made of Chinese bakelites
Abstract The detailed beam test results of the first Chinese made avalanche mode Resistive Plate Chamber are reported. The experimental set-ups at CERN GIF area are introduced. The detection efficiency, position resolution and time resolution of the chamber fulfill requirements as muon trigger for the future LHC experiments, while the rate capability is not good enough if the chamber is used at forward region. The applicability and the further possible improvements of the chamber are discussed.
121205461
Alternative formulations of first quantized covariant string action
Abstract In the covariant formulation of the first quantized action for a string propagating in Minkowski space it is natural to introduce a field (called dualbein) which is a worldsheet vector as well as a spacetime vector. The dualbein is a logical generalization of the zweibein. In terms of the dualbein field we construct new covariant actions for the bosonic strings and the superstrings. The casev of massless superparticles is also discussed.
121486574
Ordering problem in geometrical quantization
The operator ordering problem is investigated in the framework of geometrical quantization in the Schrodinger coordinate representation. It is shown that, for quantization of polarization-preserving classical observables pf(q), correct Hermitian quantum operators are derived; for quantization of polarization-unpreserving classical observables p2f(q), the BKS kernel method actually defines an ordering rule which is not Weyl's rule, but is the GCT-invariant rule proposed by DeWitt (1957).
124810245
Geometric Quantization of Anyon Systems
Geometric quantization of multiparticle systems in 2 dimensions is studied. The interpretation of the global geometry to the phase factors describing the quantum statistics of the systems is presented.
118501315
The bethe-salpeter wave functions of the free fermion-antifermion system with O-+, 1--, 1+-, 0++ and 1++
SummaryWe derived the Bethe-Salpeter wave functions of a free fermion-antifermion system with JPC = 0-+, 1--, l+-, 0++ and 1++.RiassuntoSi derivano le funzioni d’onda di Betlie-Salpeter di un sistema libero fermione-antifermione con JPC = 0-+, 1--, 1+-, 0++ e 1++.РЕжУМЕМы ВыВОДИМ ВОлНОВыЕ Ф УНкцИИ БЕтЕ-сАлпИтЕР А Дль сВОБОДНОИ ФЕРМИОН-АНтИФЕРМИОН НОИ сИстЕМы с JPC= 0-+, 1--, 1+-, 0++ И 1++.
125027606
GENERAL-SOLUTIONS OF WESS-ZUMINO CONSISTENCY CONDITIONS FOR AXIAL-VECTOR CURRENT DIVERGENCE ANOMALY
The general solutions of the Wess-Zumino Consistency conditions for axial-vector current divergence anomaly are derived. The terms different from the Bardeen's anomaly in the solutions can be eliminated by using suitable counter terms which do not violate the vector-current conservation. Thus, the Wess-Zumino conditions can be considered to be necessary and sufficient for determining the structure of the minimal consistency axial anomaly up to a multiplicative constant factor.
121118981
Numerical study on quench process and protection of BES III superconducting detector magnet
A 3D quench simulation model was developed for the BES III magnet, which is a superconducting solenoid used in Beijing Spectrometer III (BES III) of Beijing Electron and Positron Collider II (BEPC II). The BES III magnet was inner winded with aluminum stabilized Rutherford cable and conduction-cooled with forced flow of two phase helium. Quench processes of the magnet under different protection techniques were simulated with the model. The minimum quench energy, the quench propagation velocity, the maximum temperature rise and the maximum voltage drop of the coil were analyzed. Protection capabilities of the different techniques were compared according to the simulation results, and the simulation results were compared with the experimental data. Recommendations to the protection of the detector magnets are presented.
32132565
Source-plane Reconstruction of the Giant Gravitational Arc in A2667: A Candidate Wolf-Rayet Galaxy at z ~ 1
We present a new analysis of Hubble Space Telescope, Spitzer Space Telescope, and Very Large Telescope imaging and spectroscopic data of a bright lensed galaxy at z = 1.0334 in the lensing cluster A2667. Using this high-resolution imaging, we present an updated lens model that allows us to fully understand the lensing geometry and reconstruct the lensed galaxy in the source plane. This giant arc gives a unique opportunity to view the structure of a high-redshift disk galaxy. We find that the lensed galaxy of A2667 is a typical spiral galaxy with a morphology similar to the structure of its counterparts at higher redshift, z ~ 2. The surface brightness of the reconstructed source galaxy in the z 850 band reveals the central surface brightness I(0) = 20.28 ± 0.22 mag arcsec–2 and a characteristic radius rs = 2.01 ± 0.16 kpc at redshift z ~ 1. The morphological reconstruction in different bands shows obvious negative radial color gradients for this galaxy. Moreover, the redder central bulge tends to contain a metal-rich stellar population, rather than being heavily reddened by dust due to high and patchy obscuration. We analyze the VIMOS/integral field unit spectroscopic data and find that, in the given wavelength range (~1800-3200 A), the combined arc spectrum of the source galaxy is characterized by a strong continuum emission with strong UV absorption lines (Fe II and Mg II) and shows the features of a typical starburst Wolf-Rayet galaxy, NGC 5253. More specifically, we have measured the equivalent widths of Fe II and Mg II lines in the A2667 spectrum, and obtained similar values for the same wavelength interval of the NGC 5253 spectrum. Marginal evidence for [C III] 1909 emission at the edge of the grism range further confirms our expectation.
119241739
Cosmic equation of state from combined angular diameter distances: Does the tension with luminosity distances exist?
Using a relatively complete observational data concerning four angular diameter distance (ADD) measurements and %synthetic combined SN+GRB observations representing current luminosity distance (LD) data, this paper investigates the %tension between compatibility of these two cosmological distances considering three classes of dark energy equation of state (EoS) reconstruction. In particular, we use strongly gravitationally lensed systems from various large systematic gravitational lens surveys and galaxy clusters, which yield the Hubble constant independent ratio between two angular diameter distances $D_{ls}/D_s$ data. Our results demonstrate that, with more general categories of standard ruler data, ADD and LD data are compatible at $1\sigma$ level. Secondly, we note that consistency between ADD and LD data %are blind is maintained irrespective of the EoS parameterizations: there is a good match between the universally explored CPL model and other formulations of cosmic equation of state. Especially for the truncated GEoS model with $\beta=-2$, the conclusions obtained with ADD and LD are almost the same. Finally, statistical analysis of generalized dark energy equation of state performed on four classes of ADD data provides stringent constraints on the EoS parameters $w_0$, $w_{\beta}$ and $\beta$, which suggest that dark energy was a subdominant component at early times. Moreover, the GEoS parametrization with $\beta\simeq 1$ seems to be a more favorable two-parameter model to characterize the cosmic equation of state, because the combined angular diameter distance data (SGL+CBF+BAO+WMAP9) provide the best-fit value $\beta=0.751^{+0.465}_{-0.480}$.
119276084
Strong gravitational lensing of gravitational waves in Einstein Telescope
Gravitational wave experiments have entered a new stage which gets us closer to the opening a new observational window on the Universe. In particular, the Einstein Telescope (ET) is designed to have a fantastic sensitivity that will provide with tens or hundreds of thousand NS-NS inspiral events per year up to the redshift z = 2. Some of such events should be gravitationally lensed by intervening galaxies. We explore the prospects of observing gravitationally lensed inspiral NS-NS events in the Einstein telescope. Being conservative we consider the lens population of elliptical galaxies. It turns out that depending on the local insipral rate ET should detect from one per decade detection in the pessimistic case to a tens of detections per year for the most optimistic case. The detection of gravitationally lensed source in gravitational wave detectors would be an invaluable source of information concerning cosmography, complementary to standard ones (like supernovae or BAO) independent of the local cosmic distance ladder calibrations.
118606470
Constraints on a phiCDM model from strong gravitational lensing and updated Hubble parameter measurements
We constrain the scalar field dark energy model with an inverse power-law potential, i.e., V()  −α (α > 0), from a set of recent cosmological observations by compiling an updated sample of Hubble parameter measurements including 30 independent data points. Our results show that the constraining power of the updated sample of H(z) data with the HST prior on H0 is stronger than those of the SCP Union2 and Union2.1 compilations. A recent sample of strong gravitational lensing systems is also adopted to confine the model even though the results are not significant. A joint analysis of the strong gravitational lensing data with the more restrictive updated Hubble parameter measurements and the Type Ia supernovae data from SCP Union2 indicates that the recent observations still can not distinguish whether dark energy is a time-independent cosmological constant or a time-varying dynamical component.