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A multiscale perturbation expansion approach for Markov state modeling of non-stationary molecular dynamics

  • We investigate metastable dynamical systems subject to non-stationary forcing as they appear in molecular dynamics for systems driven by external fields. We show, that if the strength of the forcing is inversely proportional to the length of the slow metastable time scales of the unforced system, then the effective behavior of the forced system on slow time scales can be described by a low-dimensional reduced master equation. Our construction is explicit and uses the multiscale perturbation expansion method called two-timing, or method of multiple scales. The reduced master equation—a Markov state model—can be assembled by constructing two equilibrium Markov state models; one for the unforced system, and one for a slightly perturbed one.

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Author:Péter Koltai, Christof Schütte
Document Type:Article
Parent Title (English):SIAM J. Multiscale Model. Simul.
First Page:1455
Last Page:1485
Year of first publication:2018
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