Shear Viscosity from Gauss-Bonnet Gravity with a Dilaton Coupling

Details Shear Viscosity from Gauss-Bonnet Gravity with a Dilaton Coupling Shear Viscosity from Gauss-Bonnet Gravity with a Dilaton Coupling

2009-01-11

arxiv.org/abs/0901.1421v2

Phys.Rev.D79:066004,2009

Physics

High Energy Physics

High Energy Physics - Theory

17 pages, no figures, version to appear in PRD

Scientific paper

10.1103/PhysRevD.79.066004

We calculate the shear viscosity of field theories with gravity duals of Gauss-Bonnet gravity with a non-trivial dilaton using AdS/CFT. We find that the dilaton filed has a non-trivial contribution to the ratio of shear viscosity over entropy density and after imposing causal constraint for the boundary field theory, the new lower bound $4/25\pi$, obtained from pure Gauss-Bonnet gravity, may have a small violation.

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