Shear hydrodynamics, momentum relaxation, and the KSS bound

Abstract

In this paper we investigate the behavior of the shear hydrodynamic response functions in a simple holographic model exhibiting momentum relaxation. We compute several stress tensor response functions in the transverse channel, and from there derive the ratio of shear viscosity to entropy density, $\eta /s$, using two different methods. The two values differ from each other, one which satisfies the KSS bound $\eta /s\ge \frac{1}{4\pi }$ and one which does not, and we discuss the causes and implications of this result.

1 + 19 pages + references

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Cited by in corpus (2)

• Universal Bounds on Transport in Holographic Systems with Broken Translations
• Quartic Horndeski, planar black holes, holographic aspects and universal bounds