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Fluctuation-Response Relation in Non-Equilibrium Systems and Active Matter (2407.01821v2)

Published 1 Jul 2024 in cond-mat.stat-mech

Abstract: We use dynamic equations to derive a relation between correlation functions and response or relaxation functions in many-body systems. The relation is very general and holds both in equilibrium, when the usual fluctuation-dissipation theorem is valid, and to linear order in an expansion about arbitrary non-equilibrium states, when it is not. We illustrate our results by discussing fluids, both in equilibrium and non-equilibrium states, as well as several active-matter systems.

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