Large deviation functions contain information on the stability and response of systems driven into nonequilibrium steady states and in such a way are similar to free energies for systems at equilibrium. As with equilibrium free energies, evaluating large deviation functions numerically for all but the simplest systems is difficult because by construction they depend on exponentially rare events. In this first paper of a series, we evaluate different trajectory-based sampling methods capable of computing large deviation functions of time integrated observables within nonequilibrium steady states. We illustrate some convergence criteria and best practices using a number of different models, including a biased Brownian walker, a driven lattice gas, and a model of self-assembly. We show how two popular methods for sampling trajectory ensembles, transition path sampling and diffusion Monte Carlo, suffer from exponentially diverging correlations in trajectory space as a function of the bias parameter when estimating large deviation functions. Improving the efficiencies of these algorithms requires introducing guiding functions for the trajectories.
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Importance sampling large deviations in nonequilibrium steady states. I
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28 March 2018
Research Article|
March 29 2018
Importance sampling large deviations in nonequilibrium steady states. I
Ushnish Ray;
Ushnish Ray
a)
1
Division of Chemistry and Chemical Engineering, California Institute of Technology
, Pasadena, California 91125, USA
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Garnet Kin-Lic Chan;
Garnet Kin-Lic Chan
b)
1
Division of Chemistry and Chemical Engineering, California Institute of Technology
, Pasadena, California 91125, USA
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David T. Limmer
David T. Limmer
c)
2
Department of Chemistry, University of California
, Berkeley, California 94609, USA
3
Kavli Energy NanoScience Institute
, Berkeley, California 94609, USA
4
Materials Science Division, Lawrence Berkeley National Laboratory
, Berkeley, California 94609, USA
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a)
Electronic mail: uray@caltech.edu
b)
Electronic mail: garnetc@caltech.edu
c)
Electronic mail: dlimmer@berkeley.edu
J. Chem. Phys. 148, 124120 (2018)
Article history
Received:
September 03 2017
Accepted:
March 05 2018
Citation
Ushnish Ray, Garnet Kin-Lic Chan, David T. Limmer; Importance sampling large deviations in nonequilibrium steady states. I. J. Chem. Phys. 28 March 2018; 148 (12): 124120. https://doi.org/10.1063/1.5003151
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