Universal hydrodynamics of non-conformal branes

Details Universal hydrodynamics of non-conformal branes Universal hydrodynamics of non-conformal branes

2009-01-12

arxiv.org/abs/0901.1487v2

JHEP 0904:062,2009

Physics

High Energy Physics

High Energy Physics - Theory

28 pages. v2: refs added

Scientific paper

10.1088/1126-6708/2009/04/062

We examine the hydrodynamic limit of non-conformal branes using the recently developed precise holographic dictionary. We first streamline the discussion of holography for backgrounds that asymptote locally to non-conformal brane solutions by showing that all such solutions can be obtained from higher dimensional asymptotically locally AdS solutions by suitable dimensional reduction and continuation in the dimension. As a consequence, many holographic results for such backgrounds follow from the corresponding results of the Asymptotically AdS case. In particular, the hydrodynamics of non-conformal branes is fully determined in terms of conformal hydrodynamics. Using previous results on the latter we predict the form of the non-conformal hydrodynamic stress tensor to second order in derivatives. Furthermore we show that the ratio between bulk and shear viscosity is fixed by the generalized conformal structure to be \zeta/\eta = 2(1/(d-1) - c_s^2), where c_s is the speed of sound in the fluid.

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