Improved Hydrodynamics from the AdS/CFT

Abstract

We generalize (linearized) relativistic hydrodynamics by including all order gradient expansion of the energy momentum tensor, parametrized by four momenta-dependend transport coefficients, one of which is the usual shear viscosity. We then apply the AdS/CFT duality for $\mathcal{N}=4$ SUSY in order to compute the retarded correlators of the energy-momentum tensor. From these correlators we determine a large set of transport coefficients of third- and fourth-order hydrodynamics. We find that higher order terms have a tendency to reduce the effect of viscosity.

Comments: 26 pages, 4 figs. Refs and few comments are added. Minor corrections. Version to be published in Phys. Rev. D