paper

Transport coefficients from hyperscaling violating black brane: shear viscosity and conductivity

arXiv:1511.03008 · doi:10.1016/j.physletb.2017.08.060

Abstract

We investigate two transport coefficients, shear viscosity and conductivity, in a non-relativistic boundary filed theory without hyperscaling symmetry, which is dual to a bulk charged hyperscaling violating black brane. Employing matching method, we obtain that the ratio of shear viscosity and the entropy density is alway at any temperature, which satisfies the Kovtun-Starinets-Son (KSS) bound. Besides, we also present the universal formulas of AC conductivity, which is closely dependent on the relation between geometrical parameters and . The optical conductivity at high frequency limit behaves with a (non)-power law scaling or approaches to be constant, depending on the choice of and . This feature is different from the observes in Lifshitz black brane that the optical conductivity always complies with a (non)-power law scaling in high frequency limit when the Lifshitz exponent . We also argue that the temperate has no print on the exponent of (non)-power law scaling in large frequency while it will affect the strength of conductivity at low frequency.

16 pages, 4 figures, references added

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