Sound Mode Hydrodynamics from Bulk Scalar Fields

Details Sound Mode Hydrodynamics from Bulk Scalar Fields Sound Mode Hydrodynamics from Bulk Scalar Fields

2008-10-23

arxiv.org/abs/0810.4354v3

Phys.Rev.D79:046003,2009

Physics

High Energy Physics

High Energy Physics - Theory

17 pages. Corrections made to one of the gauge invariant equations (66). This equation was not used in the other main conclusi

Scientific paper

10.1103/PhysRevD.79.046003

We study the hydrodynamic sound mode using gauge/gravity correspondence by examining a generic black brane background's response to perturbations. We assume that the background is generated by a single scalar field, and then generalize to the case of multiple scalar fields. The relevant differential equations obeyed by the gauge invariant variables are presented in both cases. Finally, we present an analytical solution to these equations in a special case; this solution allows us to determine the speed of sound and bulk viscosity for certain special metrics. These results may be useful in determining sound mode transport coefficients in phenomenologically motivated holographic models of strongly coupled systems.

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