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2018-11-09

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/126144

Transport peak in thermal spectral function of N=4 supersymmetric Yang-Mills plasma at intermediate coupling

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https://doi.org/10.1103/PhysRevLett.121.191603

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.

Subject

Pertorbació (Dinàmica quàntica), Teoria quàntica de camps, Supergravetat

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Perturbation (Quantum dynamics), Quantum field theory, Supergravity

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Articles publicats en revistes (Física Quàntica i Astrofísica)

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CASALDERREY SOLANA, Jorge, GROZDANOV, Saso and STARINETS, Andrei O. Transport peak in thermal spectral function of N=4 supersymmetric Yang-Mills plasma at intermediate coupling. Physical Review Letters. 2018. Vol. 121, num. 191603. ISSN 0031-9007. [consulted: 17 of August of 2026]. Available at: https://hdl.handle.net/2445/126144

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