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Fermionic theory of nonequilibrium steady states

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arxiv 2308.10744 v2 pith:6IYJAHAS submitted 2023-08-21 cond-mat.stat-mech cond-mat.dis-nn

classification cond-mat.stat-mechcond-mat.dis-nn
keywords nonequilibriumstatessteadystatisticaltheorybeyondensemblesfermionic
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As the quantification of metabolism, nonequilibrium steady states play a central role in living matter, but are beyond the purview of equilibrium statistical mechanics. Here we develop a fermionic theory of nonequilibrium steady states in continuous-time Markovian systems, generalizing Boltzmann-Gibbs statistical mechanics to this case. The response to an arbitrary perturbation is computed, and simplified in canonical cases. Beyond response, we consider ensembles of nonequilibrium steady states and show that a general class of ensembles is described by a 2D statistical field theory with infinitesimally broken supersymmetry, which may form the basis of nontrivial solvable models of nonequilibrium steady states.

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  1. Entangled criticality and irreversibility in random Markov dynamics

    cond-mat.dis-nn 2026-02 conditional novelty 6.0 of 10

    A two-parameter random Markov ensemble shows heterogeneity, not asymmetry, controls most observables near a predicted critical locus; human fMRI and EEG both fall near that locus.

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