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Symmetries and geometrical properties of dynamical fluctuations in molecular dynamics

Published version
Peer-reviewed

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Authors

Jack, RL 
Kaiser, M 
Zimmer, J 

Abstract

jats:pWe describe some general results that constrain the dynamical fluctuations that can occur in non-equilibrium steady states, with a focus on molecular dynamics. That is, we consider Hamiltonian systems, coupled to external heat baths, and driven out of equilibrium by non-conservative forces. We focus on the probabilities of rare events (large deviations). First, we discuss a PT (parity-time) symmetry that appears in ensembles of trajectories where a current is constrained to have a large (non-typical) value. We analyse the heat flow in such ensembles, and compare it with non-equilibrium steady states. Second, we consider pathwise large deviations that are defined by considering many copies of a system. We show how the probability currents in such systems can be decomposed into orthogonal contributions that are related to convergence to equilibrium and to dissipation. We discuss the implications of these results for modelling non-equilibrium steady states.</jats:p>

Description

Keywords

dynamical fluctuations, large deviations, stochastic thermodynamics, molecular dynamics

Journal Title

Entropy

Conference Name

Journal ISSN

1099-4300
1099-4300

Volume Title

19

Publisher

MDPI AG