Notes on shear viscosity bound violation in anisotropic models
arXiv:1510.06861
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.
10 pages, minor changes, references added
References in corpus (6)
- Theory of universal incoherent metallic transport
- Universal Quantum Viscosity in a Unitary Fermi Gas
- Shear Viscosity from Effective Couplings of Gravitons
- Holographic RG flow of the shear viscosity to entropy density ratio in strongly coupled anisotropic plasma
- Anisotropic plasma with a chemical potential and scheme-independent instabilities
- Absence of a quantum limit to charge diffusion in bad metals