4.7 Article

Density-dependent analysis of nonequilibrium paths improves free energy estimates

期刊

JOURNAL OF CHEMICAL PHYSICS
卷 130, 期 20, 页码 -

出版社

AMER INST PHYSICS
DOI: 10.1063/1.3139189

关键词

entropy; free energy; nonequilibrium thermodynamics

资金

  1. NIH
  2. NIDDK

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When a system is driven out of equilibrium by a time-dependent protocol that modifies the Hamiltonian, it follows a nonequilibrium path. Samples of these paths can be used in nonequilibrium work theorems to estimate equilibrium quantities such as free energy differences. Here, we consider analyzing paths generated with one protocol using another one. It is posited that analysis protocols which minimize the lag, the difference between the nonequilibrium and the instantaneous equilibrium densities, will reduce the dissipation of reprocessed trajectories and lead to better free energy estimates. Indeed, when minimal lag analysis protocols based on exactly soluble propagators or relative entropies are applied to several test cases, substantial gains in the accuracy and precision of estimated free energy differences are observed.

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