A Novel Formula for Bulk Viscosity from the Null Horizon Focusing Equation

Details A Novel Formula for Bulk Viscosity from the Null Horizon Focusing Equation A Novel Formula for Bulk Viscosity from the Null Horizon Focusing Equation

2011-03-08

arxiv.org/abs/1103.1657v1

JHEP 1106:007,2011

Physics

High Energy Physics

High Energy Physics - Theory

23 pages, 1 appendix

Scientific paper

10.1007/JHEP06(2011)007

The null horizon focusing equation is equivalent via the fluid/gravity correspondence to the entropy balance law of the fluid. Using this equation we derive a simple novel formula for the bulk viscosity of the fluid. The formula is expressed in terms of the dependence of scalar fields at the horizon on thermodynamic variables such as the entropy and charge densities. We apply the formula to three classes of gauge theory plasmas: non-conformal branes, perturbations of the N=4 supersymmetric Yang-Mills theory and holographic models of QCD, and discuss its range of applicability.

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