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SEARCHES FOR SIGNATURES FROM GAUGE MEDIATED SUSY BREAKING
http://inspirehep.net/record/1342205
CR494<br /><br />by: Kanaya, Naoko (Victoria U.)<br /><br /><strong>Abstract:</strong> <br />Gauge-mediated SUSY breaking is an attractive model both theoretically and ex- perimentally. In this paper, gauge-mediated SUSY breaking signatures studied with the OPAL experiment are summarized.Kanaya, NaokoSat, 31 Jan 2015 19:18:14 GMThttp://inspirehep.net/record/1342205Nonequilibrium Quantum Field Dynamics from the Two-Particle-Irreducible Effective Action
http://inspirehep.net/record/1342204
<br />by: Laurie, Nathan S. (Swansea U.)<br /><br /><strong>Abstract:</strong> <br />The two-particle-irreducible effective action offers a powerful approach to the study of quantum field dynamics far from equilibrium. Recent and upcoming heavy ion collision experiments motivate the study of such nonequilibrium dynamics in an expanding space-time background. For the O($N$) model I derive exact, causal evolution equations for the statistical and spectral functions in a longitudinally expanding system. It is followed by an investigation into how the expansion affects the prospect of the system reaching equilibrium. Results are obtained in $1+1$ dimensions at next-to-leading order in loop- and $1/N$-expansions of the 2PI effective action. I focus on the evolution of the statistical function from highly nonequilibrium initial conditions, presenting a detailed analysis of early, intermediate and late-time dynamics. It is found that dynamics at very early times is attracted by a nonthermal fixed point of the mean field equations, after which interactions attempt to drive the system to equilibrium. The competition between the interactions and the expansion is eventually won by the expansion, with so-called freeze-out emerging naturally in this description.
In order to investigate the convergence of the 2PI-$1/N$ expansion in the O($N$) model, I compare results obtained numerically in $1+1$ dimensions at leading, next-to-leading and next-to-next-to-leading order in $1/N$. Convergence with increasing $N$, and also with decreasing coupling are discussed. A comparison is also made in the classical statistical field theory limit, where exact numerical results are available. I focus on early-time dynamics and quasi-particle properties far from equilibrium and observe rapid effective convergence already for moderate values of $1/N$ or the coupling strength.Laurie, Nathan S.Sat, 31 Jan 2015 19:14:48 GMThttp://inspirehep.net/record/1342204Toda equations for Hurwitz numbers
http://inspirehep.net/record/1342203
mathmath/0004128<br />Math.Res.Lett. 7 (2000) 447-453<br /><br />by: Okounkov, Andrei<br /><strong>Abstract:</strong> <br />We consider ramified coverings of P^1 with arbitrary ramification type over 0
and infinity and simple ramifications elsewhere and prove that the generating
function for the numbers of such coverings is a tau-function for the Toda
lattice hierarchy of Ueno and Takasaki.Okounkov, AndreiSat, 31 Jan 2015 19:13:58 GMThttp://inspirehep.net/record/1342203Schwarzschild-de-Sitter黑洞宇宙视界量子态的熵
http://inspirehep.net/record/1342202
Acta Phys.Sin. 53 (2004) 3270-3273<br /><br />by: Han, Yi-Wen (Dazhou Teachers Coll.) et al.<br /><br /><strong>Abstract:</strong> <br />Using the new equation for density of states due to the generalized uncertainty relation, the entropy of Schwarzchildde Sitter spacetime is discussed. By use of the new equation for density of states, it overcomes the shortcoming that on eliminating divergence the calculation of black hole entropy with brickwall pattern needs a cut off. Thus, it gets the result of the direct proportion betwee n black hole entropy and its horizon area, brings to light the relationship between Schwarzchildde Sitter and its cosmos event horizon and makes clear that the black hole entropy is the entropy of quantum state near the event horizon.Han, Yi-WenSat, 31 Jan 2015 18:51:18 GMThttp://inspirehep.net/record/1342202Complex Langevin dynamics as a cure for the sign problem
http://inspirehep.net/record/1342201
<br />by: James, Frank (Swansea U.)<br /><br /><strong>Abstract:</strong> <br />Theories with a chemical potential are difficult to treat numerically because teh action is complex and therefore methods based on a probability interpretation of the weight break down. This is an issue known as the sign problem. Complex Langevin dynamics was first proposed in the early 1980s and does not rely in a probability interpretation of the weight, so it can in principle be applied even where there is a severe sign problem. However, the combined problems of numerical instabilities and incorrect convergence impeded such early studies. In this work, the problem of runaway trajectories is cured by the use of a general adaptive stepsize procedure, which can be applied to both abelian and non-abelian theories. A study of the three-dimensional XY model at non-zero chemical potential follows, in which the problem of incorrect convergence is encountered. A formal justification of complex Langevin dynamics is given, from which a set of criteria are derived which can be used to test the validity of results. These ideas are applied to the SU(3) spin model, which is found to pass them all and therefore give correct results. An improved integration algorithm, which eliminates leading order step size corrections, is outlined and shown to give improved results.James, FrankSat, 31 Jan 2015 18:37:16 GMThttp://inspirehep.net/record/1342201Equivalence of Two $\chi^2$ Forms
http://inspirehep.net/record/1342200
HEPNP 27 (2003) 371-376<br /><br />by: Mo, Xiao-Hu (Beijing, Inst. High Energy Phys.) et al.<br /><br /><strong>Abstract:</strong> <br />The equivalence of two chi(2) forms is proved by matrix calculation. The bias of minimization estimate is also discussed The simplified R-value measurements are quoted to test the conclusion quantitatively.Mo, Xiao-HuSat, 31 Jan 2015 18:33:14 GMThttp://inspirehep.net/record/1342200Investigation of oscillations of electron (anti) neutrinos from muon decays
http://inspirehep.net/record/1342199
<br />by: Dohnal, Tadeas (Charles U.)<br /><br /><strong>Abstract:</strong> <br />In this thesis, the phenomenon of neutrino oscillations is investigated. General phenomenology for the three active neutrino framework is provided, along with transition probabilities in vacuum. The effect of eventual CP violation on neutrino oscillations and difficulties of its measurement are introduced. Several solutions are discussed, especially the concept of the neutrino factory (i.e. using neutrinos from muon decays) as it is projected by the nuSTORM collaboration. Energy spectra of neutrinos from unpolarized muon decays, both at rest and in ight are calculated, along with the angular distribution and other specications.Dohnal, TadeasSat, 31 Jan 2015 18:33:06 GMThttp://inspirehep.net/record/1342199Search for Neutralinos and Sleptons in scenarios with Gravitino LSP and Stau NLSP with the DELPHI detector up to 202 GeV centre-of-mass energy
http://inspirehep.net/record/1342198
DELPHI 2000-011 CONF 332<br /><br />by: Alemany, R (CERN) et al.<br /><br /><strong>Abstract:</strong> <br />Sleptons and neutralinos were searched for in the context of scenarios where the lightest supersymmetric particle is the gravitino. It was assumed that the stau is the next-to-lightest supersymmetric particle. Data collected with the DELPHI detector at centre-of-mass energies of 192, 196, 200 and 202 GeV were analysed combining the methods developed in previous searches at lower energies. No evidence for the production of these supersymmetric particles was found. Hence, limits were derived at 95% confidence level.Alemany, RSat, 31 Jan 2015 18:02:30 GMThttp://inspirehep.net/record/1342198Topological invariants in interacting Quantum Spin Hall: a Cluster Perturbation Theory approach
http://inspirehep.net/record/1342197
arXiv:1404.1287<br />New J.Phys. 17 (2015) 023004<br /><br />by: Grandi, F.<br /><strong>Abstract:</strong> <br />Using Cluster Perturbation Theory we calculate Green's functions,
quasi-particle energies and topological invariants for interacting electrons on
a 2-D honeycomb lattice, with intrinsic spin-orbit coupling and on-site e-e
interaction. This allows to define the parameter range (Hubbard U vs spin-
orbit coupling) where the 2D system behaves as a trivial insulator or Quantum
Spin Hall insulator. This behavior is confirmed by the existence of gapless
quasi-particle states in 1D honeycomb ribbon.Grandi, F.Sat, 31 Jan 2015 18:00:19 GMThttp://inspirehep.net/record/1342197Superstring Cosmology
http://inspirehep.net/record/1342195
<br />by: Gasperini, MaurizioGasperini, MaurizioSat, 31 Jan 2015 00:39:43 GMThttp://inspirehep.net/record/1342195Characterization of cryogenic bolometers and data acquisition system for the CUORE experiment
http://inspirehep.net/record/1342193
<br />by: Giachero, Andrea (U. Genoa (main))<br />Giachero, AndreaFri, 30 Jan 2015 22:59:48 GMThttp://inspirehep.net/record/1342193Experiments and Monte Carlo Analysis for the Optical Properties of the Scintillator in SNO+
http://inspirehep.net/record/1342192
<br />by: Liu, Xu (Queen's U., Kingston)<br /><br /><strong>Abstract:</strong> <br />The SNO+ experiment will be the SNO detector filled with a neodymium-loaded liquid scintillator instead of heavy water. SNO+ will be used to detect neutrinos of much lower energy. Also, SNO+ will conduct a search for neutrinoless double beta decay with 150Nd. The Nd-loaded scintillator in SNO+ will be made from linear alkylbenzene (LAB). Both the LAB solvent and the Nd loading are new developments. The optical properties of this scintillator and information about radioactive backgrounds should be studied. A calibration source known as the scintillator bucket was deployed in the water- filled SNO detector in order to study some optical properties of Nd-loaded scintillator, raw LAB scintillator and distilled LAB scintillator. Using a neutron source attached to the bucket to produce events with known energy, with a model of the scintillator bucket simulated by an analysis tool called RAT, the light yield of the scintillator could be determined by comparing data measurements with simulations. This allowed the light yield, one of the main optical properties of the scintillator, to be measured and that value to be corrected in the Monte Carlo. The bucket was deployed both at the centre of the detector and at the bottom. After subtracting backgrounds from radon introduced in the scintillator during preparation and filling, constraints on the amount of 210Po were obtained. Estimates on the 40K content of the Nd-loaded scintillator were obtained by analyzing the radon subtracted background spectra. By comparing the background spectra with the bucket deployed at the bottom of the acrylic vessel with spectra from the bucket at the centre, it was possible to estimate the 40K content of the acrylic vessel.Liu, XuFri, 30 Jan 2015 22:58:48 GMThttp://inspirehep.net/record/1342192Effect of density-dependent symmetry energy on nuclear stopping
http://inspirehep.net/record/1342138
J.Phys. G39 (2012) 095105<br /><br />by: Vinayak, Karan Singh<br /><strong>Abstract:</strong> <br />By using an isospin-dependent quantum molecular dynamics model we study the effect of density-dependent symmetry energy on nuclear stopping. Reactions are carried out for Ca + Ca, Ni + Ni and Sn + Sn for different isotopic compositions. Our aim is to pin down the influence of density-dependent symmetry energy on nuclear stopping. The nuclear stopping is found to decrease with an increase in stiffness of density-dependent symmetry energy. The mild sensitivity of nuclear stopping to different forms of density-dependent symmetry energy is due to the small variation in the density.Vinayak, Karan SinghFri, 30 Jan 2015 14:11:22 GMThttp://inspirehep.net/record/13421382012-07-27Dynamical Systems with Constraints and the Extended Phase-Space
http://inspirehep.net/record/1342137
Ann.U.Craiova Phys. 1 (1991) S18-S21<br /><br />by: Constantinescu, R. (Craiova U.)<br /><br /><strong>Abstract:</strong> <br />The paper presents two important problems concerning the constrained dynamical systems. The first problem we are dealing with is the manner in which one can separate the first-class and the second-class constraints of a system. We shall analyse also the structure of the phase-space in the framework of the extended BRST quantization procedure; the effective construction of this “extended phase- space” for a system with two first-class constraints will be done.Constantinescu, R.Fri, 30 Jan 2015 14:03:47 GMThttp://inspirehep.net/record/13421371991Introducing Chiral Fermions through the Compactification of Symmetric Fields on Homogeneous Spaces
http://inspirehep.net/record/1342136
Ann.U.Craiova Phys. 1 (1991) S13-S17<br /><br />by: Saliu, L. (Craiova U.)<br /><br /><strong>Abstract:</strong> <br />By adopting the framework of the heterotic string inspired high-dimensional (D=10) theory with E 8 as prior compactification gauge symmetry, the main group features of the potentially flavor-chiral GUT models emerging from compactification of symmetric fields on homogeneous space are discussed. It is also examined the nature of some common features of flavor-chiral GUT’s obtained via different compactification schemes, namely on Calabi-Yau manifolds and respectively on homogeneous spaces.Saliu, L.Fri, 30 Jan 2015 14:01:18 GMThttp://inspirehep.net/record/13421361991Superstring Inspired GUT-Models with Chiral Fermions
http://inspirehep.net/record/1342135
Ann.U.Craiova Phys. 1 (1991) S7-S12<br /><br />by: Gherman, O. (Craiova U.) et al.<br /><br /><strong>Abstract:</strong> <br />By using the general solutions [1] [2] concerning the number of the four- dimensional space-time massles chiral spin ½ generations in superstring theory and invoking mainly the related group theory arguments, the gauge symmetries and the content of the light chiral sector of the possible GUT- models emerging via the D=10 heterotic string compactification are examined.Gherman, O.Fri, 30 Jan 2015 13:58:46 GMThttp://inspirehep.net/record/13421351991Extravariables in the BRST Quantization of Fermionic Systems
http://inspirehep.net/record/1342134
Ann.U.Craiova Phys. 1 (1991) S1-S6<br /><br />by: Bizdadea, C. (Craiova U.) et al.<br /><br /><strong>Abstract:</strong> <br />In this paper, a new method of quantization for purely fermionic systems is presented. We shall prove that for such systems it is possible to replace the original second-class constrains with some first-class ones by adding fermionic extradegrees of freedom. The resulting one-parameter family of first-class systems is quantized in the Hamiltonian BRST formalism such that its corresponding path integral coincides with the one of the original system.Bizdadea, C.Fri, 30 Jan 2015 13:56:45 GMThttp://inspirehep.net/record/13421341991A symmetrical BRST-antiBRST generator for the gauge theories with open algebra
http://inspirehep.net/record/1342133
Ann.U.Craiova Phys. 2-3 (1992-1993) S87-S97<br /><br />by: Babalean, A. (Craiova U.) et al.<br /><br /><strong>Abstract:</strong> <br />We propose a new form for the solution of the master equation corresponding to the covariant quantization of the gauge theories with open algebra in the framework of the extended sp(2) BRST symmetry. Apart from the solutions usually met in the literature, our solution belongs to the class of “symmetrical” possible solutions: the bosonic generator of the BRST-antiBRST symmetry contains terms with the same number of ghost fields and antifields only.Babalean, A.Fri, 30 Jan 2015 13:54:31 GMThttp://inspirehep.net/record/13421331993The Lagrangian BRST-anti-BRST approach of the Yang-Mills theory
http://inspirehep.net/record/1342132
Ann.U.Craiova Phys. 2-3 (1992-1993) S21-S35<br /><br />by: Bizdadea, C. (Craiova U.) et al.<br /><br /><strong>Abstract:</strong> <br />In this paper, we quantize the pure Yang-Mills theory in the light of the antibracket-antifield BRST-anti-BRST formalism, showing that the resulting path integral coincides with the one inferred in the framework of the standard BRTS approaches.Bizdadea, C.Fri, 30 Jan 2015 13:52:46 GMThttp://inspirehep.net/record/13421321993Equivalence between the Hamiltonian and the Lagrangian Path Integrals for the Yang-Mills Theory
http://inspirehep.net/record/1342131
Ann.U.Craiova Phys. 2-3 (1992-1993) S13-S20<br /><br />by: Antonie, D. (Craiova U.) et al.<br /><br /><strong>Abstract:</strong> <br />The equivalence between the BRST Lagrangian, total, extended and Hamiltonian path integrals for Yang-Mills theory is investigated. It is shown that the above path integrals are equivalent one to another. The main ingredient enabling the proof of the equivalence is constituted by the change of the non-minimal sector and gauge-fixing fermion at the level of total formalism.Antonie, D.Fri, 30 Jan 2015 13:50:25 GMThttp://inspirehep.net/record/13421311993Quantization of Hall Conductance for Interacting Electrons on a Torus
http://inspirehep.net/record/1342130
Commun.Math.Phys. 334 (2015) 433-471<br /><br />by: Hastings, Matthew B.<br /><strong>Abstract:</strong> <br />We consider interacting, charged spins on a torus described by a gapped Hamiltonian with a unique groundstate and conserved local charge. Using quasi-adiabatic evolution of the groundstate around a flux-torus, we prove, without any averaging assumption, that the Hall conductance of the groundstate is quantized in integer multiples of e$^{2}$/h, up to exponentially small corrections in the linear size L. In addition, we discuss extensions to the fractional quantization case under an additional topological order assumption on the degenerate groundstate subspace.Hastings, Matthew B.Fri, 30 Jan 2015 13:49:53 GMThttp://inspirehep.net/record/13421302014-09-21Unitarity of the SoV Transform for the Toda Chain
http://inspirehep.net/record/1342129
Commun.Math.Phys. 334 (2015) 223-273<br /><br />by: Kozlowski, K.K.<br /><strong>Abstract:</strong> <br />The quantum separation of variables method consists in mapping the original Hilbert space where a spectral problem is formulated onto one where the spectral problem takes a simpler “separated” form. In order to realise such a program, one should construct the map explicitly and then show that it is unitary. In the present paper, we develop a technique which allows one to prove the unitarity of this map in the case of the quantum Toda chain. Our proof solely builds on objects and relations naturally arising in the framework of the so-called quantum inverse scattering method. Hence, with minor modifications, it should be readily transposable to other quantum integrable models solvable by the quantum separation of variables method. As such, it provides an important alternative to the proof of the map’s unitarity based on the group theoretical interpretation of the quantum Toda chain, which is absent for more complex quantum integrable models.Kozlowski, K.K.Fri, 30 Jan 2015 13:49:46 GMThttp://inspirehep.net/record/13421292014-08-29Proceedings, 56th DAE Symposium on Nuclear Physics: Visakhapatnam, A.P., India, December 26-30, 2011
http://inspirehep.net/record/1342128
DAE Sym.Nucl.Phys. 56 (2011) pp.1-1183<br />Fri, 30 Jan 2015 13:49:19 GMThttp://inspirehep.net/record/1342128Self-Dual Symmetric Nontopological Solutions in the SU(3) Model in ${\mathbb{R}2}$
http://inspirehep.net/record/1342127
Commun.Math.Phys. 334 (2015) 1-37<br /><br />by: Choe, Kwangseok (Inha U.) et al.<br /><br /><strong>Abstract:</strong> <br />In this paper, we study non-topological solutions (u$_{1}$, u$_{2}$) to the SU(3) Chern–Simons system, satisfying the asymptotic behavior ${u_k(x)=-2\alpha_k\ln |x|+O(1)}$ for some ${\alpha_k > 1, k = 1, 2}$ . We show that solutions remain uniformly bounded as long as (α$_{1}$, α$_{2}$) lies in S$_{N}$ (see Sect. 1), and then we prove the existence of non-topological solutions for any ${(\alpha_1,\alpha_2)\in S_N}$ . For this purpose, we have to study the phenomena of partial blowup at infinity, and show that S$_{N}$ is the optimal range of (α$_{1}$, α$_{2}$) such that the partial blowup could occur if (α$_{1}$, α$_{2}$) is on some part of ${\partial S_N}$ .Choe, KwangseokFri, 30 Jan 2015 13:48:50 GMThttp://inspirehep.net/record/13421272014-09-03More than the sp(2) BRST theory
http://inspirehep.net/record/1342126
Ann.U.Craiova Phys. 4-5 (1994-1995) S92-S99<br /><br />by: Constantinescu, Radu (Craiova U.)<br /><br /><strong>Abstract:</strong> <br />The goal of this paper is to prove the possibility of the existence of a generalized BRST symmetry, larger than the sp(2) symmetry. For this purpose, the extended phase space is to be structured on several levels, and several copies of the same type of variables are to be considered. New graduations of the variables will be joined to the standard ghost-number: the “level-number” and the “cop-number”. A generalized BRST differential can be constructed as the sum of several nilpotent and anticommuting operators, such that the first two items of this sum could be identified as the standard BRST operator and, respectively, as the anti-BRST symmetry. The effective construction of this multiple symmetry will be done in the Hamiltonian formalism for a “three levels” irreducible theory.Constantinescu, RaduFri, 30 Jan 2015 13:48:08 GMThttp://inspirehep.net/record/13421261995