Shear Viscosity from Gauss-Bonnet Gravity with a Dilaton Coupling
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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 $4/25π$, obtained from pure Gauss-Bonnet gravity, may have a small violation.
17 pages, no figures, version to appear in PRD
17 pages, no figures, version to appear in PRD