The Experts below are selected from a list of 244140 Experts worldwide ranked by ideXlab platform
Andrew J Larkoski - One of the best experts on this subject based on the ideXlab platform.
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conformal invariance of the subleading soft theorem in Gauge Theory
Physical Review D, 2014Co-Authors: Andrew J LarkoskiAbstract:In this note, I show that the recently proposed subleading soft factor in massless Gauge Theory uniquely follows from conformal symmetry of tree-level Gauge Theory amplitudes in four dimensions.
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conformal invariance of the subleading soft theorem in Gauge Theory
Physical Review Letters, 2014Co-Authors: Andrew J LarkoskiAbstract:Recently, Cachazo and Strominger proposed a new soft theorem for gravity motivated by a conjecture of an enhanced symmetry of the quantum gravity S matrix [1]. Shortly after their paper, it was pointed out that a similar soft theorem exists for Gauge Theory [2]. 1 Unlike gravity, massless tree-level Gauge Theory amplitudes in four dimensions are invariant under conformal transformations and this extra symmetry constrains the possible form of the subleading soft factor. With the conformal invariance as a guide, I will show that the subleading soft theorem in Gauge Theory at tree level is uniquely determined. To determine the soft theorems, we consider a colorordered and coupling-stripped n-point amplitude An in pure Yang-Mills Gauge Theory written in the spinor-helicity formalism [11,12]. The amplitude can then be expressed as a function of the holomorphic λi and antiholomorphic ~ λi two-component spinors for particle i,
Alex Buchel - One of the best experts on this subject based on the ideXlab platform.
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bulk viscosity of Gauge Theory plasma at strong coupling
Physics Letters B, 2008Co-Authors: Alex BuchelAbstract:Abstract We propose an inequality on bulk viscosity of strongly coupled Gauge Theory plasmas that allow for a dual supergravity description. Using explicit example of the N = 2 ∗ Gauge Theory plasma we show that the bulk viscosity remains finite at a critical point with a divergent specific heat. We present an estimate for the bulk viscosity of QGP plasma at RHIC.
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the shear viscosity of Gauge Theory plasma with chemical potentials
Physics Letters B, 2007Co-Authors: Paolo Benincasa, Alex Buchel, Roman NaryshkinAbstract:We consider strongly coupled Gauge Theory plasma with conserved global charges that allow for a dual gravitational description. We study the shear viscosity of the Gauge Theory plasma in the presence of chemical potentials for these charges. Using Gauge Theory/string Theory correspondence we prove that at large 't Hooft coupling the ratio of the shear viscosity to the entropy density is universal.
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sound waves in strongly coupled non conformal Gauge Theory plasma
Nuclear Physics, 2006Co-Authors: Paolo Benincasa, Alex Buchel, Andrei O StarinetsAbstract:Using Gauge Theory/gravity duality we study sound wave propagation in strongly coupled non-conformal Gauge Theory plasma. We compute the speed of sound and the bulk viscosity of View the MathML source supersymmetric SU(Nc) Yang–Mills plasma at a temperature much larger than the mass scale of the Theory in the limit of large Nc and large 't Hooft coupling. The speed of sound is computed both from the equation of state and the hydrodynamic pole in the stress–energy tensor two-point correlation function. Both computations lead to the same result. Bulk viscosity is determined by computing the attenuation constant of the sound wave mode.
Paolo Benincasa - One of the best experts on this subject based on the ideXlab platform.
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the shear viscosity of Gauge Theory plasma with chemical potentials
Physics Letters B, 2007Co-Authors: Paolo Benincasa, Alex Buchel, Roman NaryshkinAbstract:We consider strongly coupled Gauge Theory plasma with conserved global charges that allow for a dual gravitational description. We study the shear viscosity of the Gauge Theory plasma in the presence of chemical potentials for these charges. Using Gauge Theory/string Theory correspondence we prove that at large 't Hooft coupling the ratio of the shear viscosity to the entropy density is universal.
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sound waves in strongly coupled non conformal Gauge Theory plasma
Nuclear Physics, 2006Co-Authors: Paolo Benincasa, Alex Buchel, Andrei O StarinetsAbstract:Using Gauge Theory/gravity duality we study sound wave propagation in strongly coupled non-conformal Gauge Theory plasma. We compute the speed of sound and the bulk viscosity of View the MathML source supersymmetric SU(Nc) Yang–Mills plasma at a temperature much larger than the mass scale of the Theory in the limit of large Nc and large 't Hooft coupling. The speed of sound is computed both from the equation of state and the hydrodynamic pole in the stress–energy tensor two-point correlation function. Both computations lead to the same result. Bulk viscosity is determined by computing the attenuation constant of the sound wave mode.
Horacio Oscar Girotti - One of the best experts on this subject based on the ideXlab platform.
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Noncommutative quantum mechanics as a Gauge Theory
Physical Review D, 2009Co-Authors: Fábio Sperotto Bemfica, Horacio Oscar GirottiAbstract:The classical counterpart of noncommutative quantum mechanics is a constrained system containing only second-class constraints. The embedding procedure formulated by Batalin, Fradkin and Tyutin (BFT) enables one to transform this system into an Abelian Gauge Theory exhibiting only first class constraints. The appropriateness of the BFT embedding, as implemented in this work, is verified by showing that there exists a one to one mapping linking the second-class model with the Gauge invariant sector of the Gauge Theory. As is known, the functional quantization of a Gauge Theory calls for the elimination of its Gauge freedom. Then, we have at our disposal an infinite set of alternative descriptions for noncommutative quantum mechanics, one for each Gauge. We study the relevant features of this infinite set of correspondences. The functional quantization of the Gauge Theory is explicitly performed for two Gauges and the results compared with that corresponding to the second-class system. Within the operator framework the Gauge Theory is quantized by using Dirac's method.
P. C. Stichel - One of the best experts on this subject based on the ideXlab platform.
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Moving vortices in noncommutative Gauge Theory
Physics Letters B, 2004Co-Authors: P. A. Horvathy, P. C. StichelAbstract:Exact time-dependent solutions of nonrelativistic noncommutative Chern - Simons Gauge Theory are presented in closed analytic form. They are different from (indeed orthogonal to) those discussed recently by Hadasz, Lindstrom, Rocek and von Unge. Unlike theirs, our solutions can move with an arbitrary constant velocity, and can be obtained from the previously known static solutions by the recently found ``exotic\'\' boost symmetry.
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Galilean noncommutative Gauge Theory: symmetries & vortices
Nuclear Physics B, 2003Co-Authors: P. A. Horvathy, L. Martina, P. C. StichelAbstract:Noncommutative Chern-Simons Gauge Theory coupled to nonrelativistic scalars or spinors is shown to admit the ``exotic\'\' two-parameter-centrally extended Galilean symmetry, realized in a unique way consistent with the Seiberg-Witten map. Nontopological spinor vortices and topological external-field vortices are constructed by reducing the problem to previously solved self-dual equations.
