Universal diffusion in incoherent black holes

Abstract

We study charge and energy diffusion in simple holographic theories with broken translational symmetry. We find that when the effects of momentum relaxation are very strong the diffusion constants take universal values Dc∼De∼$\hslash$$\upsilon$$^{2}$$_{B}$($\textit{k}$$_{B}$T). Here $\upsilon$$_{B}$ is the velocity of the butterfly effect and the coefficients of proportionality depend only on the scaling exponents of the infra-red fixed point. Our results suggest that diffusion in these incoherent black holes is controlled by τ∼$\hslash$($\textit{k}$$_{B}$T) independently of the mechanism of momentum relaxation.I am funded through a Junior Research Fellowship from Churchill College, University of Cambridge. This work was supported in part by the European Research Council (ERC) under the European Unions Seventh Framework Programme (Grant No. FP7/2007-2013), ERC Grant No. STG 279943, Strongly Coupled Systems