Kinetic theory of current fluctuations in simple classical liquids

Abstract

A theory for the memory function of the phase-space correlation function is presented, based on a general kinetic approach. The memory function is separated into an essentially binary-collision part and a more collective tail represented by a mode-mode coupling term, which includes recollisions to all orders. From the resulting expression for the memory function we obtain calculable expressions for the longitudinal and transverse current correlation functions.