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American Physical Society, Physical review E: Statistical, nonlinear, and soft matter physics, 1(89), 2014

DOI: 10.1103/physreve.89.012150

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

Journal article published in 2014 by Bongsoo Kim, Kyozi Kawasaki, Hugo Jacquin, Frédéric van Wijland
This paper is available in a repository.
This paper is available in a repository.

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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.