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Title: Transport peak in thermal spectral function of N=4 supersymmetric Yang-Mills plasma at intermediate coupling
Author: Casalderrey Solana, Jorge
Grozdanov, Saso
Starinets, Andrei O.
Keywords: Pertorbació (Dinàmica quàntica)
Teoria quàntica de camps
Perturbation (Quantum dynamics)
Quantum field theory
Issue Date: 9-Nov-2018
Publisher: American Physical Society
Abstract: We study the structure of thermal spectral function of the stress-energy tensor in N=4 supersymmetric Yang-Mills theory at intermediate 't Hooft coupling and infinite number of colors. In gauge-string duality, this analysis reduces to the study of classical bulk supergravity with higher-derivative corrections, which correspond to (inverse) coupling corrections on the gauge theory side. We extrapolate the analysis of perturbative leading-order corrections to intermediate coupling by nonperturbatively solving the equations of motion of metric fluctuations dual to the stress-energy tensor at zero spatial momentum. We observe the emergence of a separation of scales in the analytic structure of the thermal correlator associated with two types of characteristic relaxation modes. As a consequence of this separation, the associated spectral function exhibits a narrow structure in the small frequency region which controls the dynamics of transport in the theory and may be described as a transport peak typically found in perturbative, weakly interacting thermal field theories. We compare our results with generic expectations drawn from perturbation theory, where such a structure emerges as a consequence of the existence of quasiparticles.
Note: Reproducció del document publicat a:
It is part of: Physical Review Letters, 2018, vol. 121, p. 191603
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ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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