Hydrodynamics and beyond in the strongly coupled N=4 plasma

Details Hydrodynamics and beyond in the strongly coupled N=4 plasma Hydrodynamics and beyond in the strongly coupled N=4 plasma

2008-05-16

arxiv.org/abs/0805.2570v1

JHEP 0807:133,2008

Physics

High Energy Physics

High Energy Physics - Theory

29 pages, 11 figures

Scientific paper

10.1088/1126-6708/2008/07/133

We continue our investigations on the relation between hydrodynamic and higher quasinormal modes in the AdS black hole background started in arXiv:0710.4458 [hep-th]. As is well known, the quasinormal modes can be interpreted as the poles of the retarded Green functions of the dual N=4 gauge theory at finite temperature. The response to a generic perturbation is determined by the residues of the poles. We compute these residues numerically for energy-momentum and R-charge correlators. We find that the diffusion modes behave in a similar way: at small wavelengths the residues go over into a form of a damped oscillation and therefore these modes decouple at short distances. The sound mode behaves differently: its residue does not decay and at short wavelengths this mode behaves as the higher quasinormal modes. Applications of our findings include the definition of hydrodynamic length and time scales. We also show that the quasinormal modes, including the hydrodynamic diffusion modes, obey causality.

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