Universality of second order transport coefficients from the gauge-string duality

TL;DR

This paper demonstrates a universal relation among second order transport coefficients in strongly coupled conformal gauge theory plasmas with gravity duals, extending the concept of universality beyond shear viscosity.

Contribution

The study reveals a universal relation among second order transport coefficients in a broad class of gauge theories with gravity duals, under mild assumptions.

Findings

Second order transport coefficients satisfy a universal relation.

Universality extends beyond shear viscosity to other transport coefficients.

Applicable to strongly coupled conformal gauge theories with conserved charges.

Abstract

We consider the strongly coupled limit of conformal gauge theory plasmas with conserved U(1) charges which have a gravity dual. We show that, under mild restrictions, the second order transport coefficients of such theories satisfy a universal relation among themselves, similar to the shear viscosity to entropy ratio.