Abstract
The shear viscosity bound violation in Einstein gravity for anisotropic black branes is discussed, with the aim of constraining the deviation of the shear viscosity-entropy density ratio from the shear viscosity bound using causality and thermodynamics analysis. The results show that no stringent constraints can be imposed. The diffusion bound in anisotropic phases is also studied. Ultimately, it is concluded that shear viscosity violation always occurs in cases where the equation of motion of the metric fluctuations cannot be written in a form identical to that of the minimally coupled massless scalar fields.
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Ge, X. Notes on shear viscosity bound violation in anisotropic models. Sci. China Phys. Mech. Astron. 59, 630401 (2016). https://doi.org/10.1007/s11433-015-5776-2
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DOI: https://doi.org/10.1007/s11433-015-5776-2