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Uncertainty quantification for generalized Langevin dynamics

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4971433· OSTI ID:1465368
 [1];  [2];  [2]
  1. Univ. of Massachusetts, Amherst, MA (United States). Dept. of Mathematics and Statistics; Department of Mathematics and Statistics, University of Massachusetts Amherst, Amherst, Massachusetts 01003, USA
  2. Univ. of Massachusetts, Amherst, MA (United States). Dept. of Mathematics and Statistics
Here, we present efficient finite difference estimators for goal-oriented sensitivity indices with applications to the generalized Langevin equation (GLE). In particular, we apply these estimators to analyze an extended variable formulation of the GLE where other well known sensitivity analysis techniques such as the likelihood ratio method are not applicable to key parameters of interest. These easily implemented estimators are formed by coupling the nominal and perturbed dynamics appearing in the finite difference through a common driving noise or common random path. After developing a general framework for variance reduction via coupling, we demonstrate the optimality of the common random path coupling in the sense that it produces a minimal variance surrogate for the difference estimator relative to sampling dynamics driven by independent paths. In order to build intuition for the common random path coupling, we evaluate the efficiency of the proposed estimators for a comprehensive set of examples of interest in particle dynamics. These reduced variance difference estimators are also a useful tool for performing global sensitivity analysis and for investigating non-local perturbations of parameters, such as increasing the number of Prony modes active in an extended variable GLE.
Research Organization:
Univ. of Massachusetts, Amherst, MA (United States). Dept. of Mathematics and Statistics
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
SC0010723
OSTI ID:
1465368
Alternate ID(s):
OSTI ID: 1336482
Journal Information:
Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 22 Vol. 145; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

Model reduction techniques for the computation of extended Markov parameterizations for generalized Langevin equations text January 2021
Homogenization for Generalized Langevin Equations with Applications to Anomalous Diffusion journal February 2020
Fine tuning classical and quantum molecular dynamics using a generalized Langevin equation journal March 2018

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