One-loop real-time density correlations in causal diffusion reduce to known acausal results in the overdamped limit and yield a new universal scaling function in the underdamped limit.
¨Uber Diffusion,
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Comparison between Causal and Acausal Diffusion: a Schwinger-Keldysh Effective Field Theory Perspective
One-loop real-time density correlations in causal diffusion reduce to known acausal results in the overdamped limit and yield a new universal scaling function in the underdamped limit.