Abstract
We investigate the behavior of energy-momentum tensor correlators in holographic {mathcal N}=4 super Yang–Mills plasma, taking finite coupling corrections into account. In the thermal limit we determine the flow of quasinormal modes as a function of the ’t Hooft coupling. Then we use a specific model of holographic thermalization to study the deviation of the spectral densities from their thermal limit in an out-of-equilibrium situation. The main focus lies on the thermalization pattern with which the plasma constituents approach their thermal distribution as the coupling constant decreases from the infinite coupling limit. All obtained results point towards the weakening of the usual top-down thermalization pattern.
Highlights
Understanding the complicated field dynamics in a heavy ion collision presents a difficult challenge to QCD theorists
In its original form the gauge gravity duality relates supergravity on five-dimensional asymptotically anti deSitter space time (AdS) to strongly coupled N = 4 super Yang Mills (SYM) theory living on the boundary of the AdS space
For gravitational perturbations the quasinormal mode (QNM) spectrum was first obtained in the infinite coupling limit in [54,70] and the diffusion poles in the hydrodynamic limit at finite coupling were worked out in [56,66]
Summary
Understanding the complicated field dynamics in a heavy ion collision presents a difficult challenge to QCD theorists. Experiments at RHIC and the LHC point towards the conclusion that the quark gluon plasma (QGP) created in heavy ion collisions behaves as a strongly coupled, nearly perfect, liquid [1,2] rather than a weakly interacting gas of quarks and gluons. One useful development is the application of the duality to out-of-equilibrium systems by mapping the thermalization process to black hole formation in asymptotically AdS space. This has led to the insight that fluid dynamics becomes a good approximation rather quickly, but this does not mean that the system is isotropic or thermal [5,6,7,8,9]
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