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Evaluation of transition rates from nonequilibrium instantons

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arXiv:2403.18794v1 Announce Type: new
Abstract: Equilibrium rate theories play a crucial role in understanding rare, reactive events. However, they are inapplicable to a range of irreversible processes in systems driven far from thermodynamic equilibrium like active and biological matter. Here, we develop a general, computationally efficient nonequilibrium rate theory in the weak-noise limit based on an instanton approximation to the stochastic path integral and illustrate its wide range of application in the study of rare nonequilibrium events. We demonstrate excellent agreement of the instanton rates with numerically exact results for a particle under a non-conservative force. We also study phase transitions in an active field theory. We elucidate how activity alters the stability of the two phases and their rates of interconversion in a manner that can be well-described by modifying classical nucleation theory

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