Notes on the bulk viscosity of holographic gauge theory plasmas

Details Notes on the bulk viscosity of holographic gauge theory plasmas Notes on the bulk viscosity of holographic gauge theory plasmas

2009-12-10

arxiv.org/abs/0912.2100v1

JHEP 1004:024,2010

Physics

High Energy Physics

High Energy Physics - Theory

11 pages

Scientific paper

10.1007/JHEP04(2010)024

A novel technique is used to compute the bulk viscosity of high temperature holographic gauge theory plasmas with softly broken conformal symmetry. Working in a black hole background which corresponds to a non-trivial solution to the Navier-Stokes equation, and using a Ward identity for the trace of the stress-energy tensor, it is possible to obtain an analytic expression for the bulk viscosity. This can be used to verify the high temperature limit of a conjectured bound on the bulk viscosity for these theories. The bound is saturated when the conformal symmetry-breaking operator becomes marginal.

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