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The recently developed effective field theory of fluctuations around thermal equilibrium is used to compute late-time correlation functions of conserved densities. Specializing to systems with a single conservation law, we find that the diffusive pole is shifted in the presence of nonlinear hydrodynamic self-interactions, and that the density-density Green's function acquires a branch point halfway to the diffusive pole, at frequency ω=- (i/2) Dk^2. We discuss the relevance of diffusive fluctuations for strongly correlated transport in condensed matter and cold atomic systems.
Chen-Lin et al. (Wed,) studied this question.
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