Thermodynamic nonlinear response relation.
basic_science · Level V
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- Record sourced from PubMed, PMID 33862688.
- Also identified by DOI 10.1103/PhysRevE.103.032116.
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Abstract
The fluctuation-dissipation theorem connects equilibrium to mildly (linearly) perturbed situations in a thermodynamic manner: It involves the observable of interest and the entropy production caused by the perturbation. We derive a relation which connects responses of arbitrary order in perturbation strength to correlations of entropy production of lower order, thereby extending the fluctuation-dissipation theorem to cases far from equilibrium in a thermodynamic way. The relation is validated and studied for a four-state model which is coarse-grained to a non-Markovian two-state model.