Shear Viscosity to Entropy Density for a Black Brane in 5-dimensional Einstein-Yang-Mills Gravity

Abstract

We calculate the ratio of shear viscosity to entropy density for a black brane of $5$-dimensional Einstein-Yang-Mills Gravity by Kubo and membrane paradigm methods. The former gives $\frac{1}{4\pi }$ exactly which is an expected result in the context of the Einstein-Hilbert gravity. In contrast, the membrane paradigm reaches $\frac{1}{4\pi }$ only in large horizon radius limit. We comment on this discrepancy.

11 pages. v2: ref added, errors fixed,results and discussion up-dated

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Cited by in corpus (1)

• Weak Gravity Conjecture, Black Branes and Violations of Universal Thermodynamic Relation