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arXiv · 1612.05950

Notes on hyperscaling violating Lifshitz and shear diffusion

Kedar S. Kolekar·Debangshu Mukherjee·K. Narayan
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Abstract

We explore in greater detail our investigations of shear diffusion in hyperscaling violating Lifshitz theories in arXiv:1604.05092 [hep-th]. This adapts and generalizes the membrane-paradigm-like analysis of Kovtun, Son and Starinets for shear gravitational perturbations in the near horizon region given certain self-consistent approximations, leading to the shear diffusion constant on an appropriately defined stretched horizon. In theories containing a gauge field, some of the metric perturbations mix with some of the gauge field perturbations and the above analysis is somewhat more complicated. We find a similar near-horizon analysis can be obtained in terms of new field variables involving a linear combination of the metric and the gauge field perturbation resulting in a corresponding diffusion equation. Thereby as before, for theories with Lifshitz and hyperscaling violating exponents $z, \theta$ satisfying $z<4-\theta$ in four bulk dimensions, our analysis here results in a similar expression for the shear diffusion constant with power-law scaling with temperature suggesting universal behaviour in relation to the viscosity bound. For $z=4-\theta$, we find logarithmic behaviour.

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Kedar S. Kolekar, Debangshu Mukherjee, K. Narayan. 2016-12-18. Notes on hyperscaling violating Lifshitz and shear diffusion. https://doi.org/10.1103/physrevd.96.026003

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