Equilibrium dynamics of the Dean-Kawasaki equation: mode-coupling theory and its extension

Phys Rev E Stat Nonlin Soft Matter Phys. 2014 Jan;89(1):012150. doi: 10.1103/PhysRevE.89.012150. Epub 2014 Jan 31.

Abstract

We extend a previously proposed field-theoretic self-consistent perturbation approach for the equilibrium dynamics of the Dean-Kawasaki equation presented in [Kim and Kawasaki, J. Stat. Mech. (2008) P02004]. By taking terms missing in the latter analysis into account we arrive at a set of three new equations for correlation functions of the system. These correlations involve the density and its logarithm as local observables. Our new one-loop equations, which must carefully deal with the noninteracting Brownian gas theory, are more general than the historic mode-coupling one in that a further approximation corresponding to Gaussian density fluctuations leads back to the original mode-coupling equation for the density correlations alone. However, without performing any further approximation step, our set of three equations does not feature any ergodic-nonergodic transition, as opposed to the historical mode-coupling approach.

Publication types

  • Research Support, Non-U.S. Gov't