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• W2139158220 abstract "The question of coarse-graining is ubiquitous in molecular dynamics. In this article, we are interested in deriving effective properties for the dynamics of a coarse-grained variable $xi(x)$, where $x$ describes the configuration of the system in a high-dimensional space $R^n$, and $xi$ is a smooth function with value in $R$ (typically a reaction coordinate). It is well known that, given a Boltzmann-Gibbs distribution on $x in R^n$, the equilibrium properties on $xi(x)$ are completely determined by the free energy. On the other hand, the question of the effective dynamics on $xi(x)$ is much more difficult to address. Starting from an overdamped Langevin equation on $x in R^n$, we propose an effective dynamics for $xi(x) in R$ using conditional expectations. Using entropy methods, we give sufficient conditions for the time marginals of the effective dynamics to be close to the original ones. We check numerically on some toy examples that these sufficient conditions yield an effective dynamics which accurately reproduces the residence times in the potential energy wells. We also discuss the accuracy of the effective dynamics in a pathwise sense, and the relevance of the free energy to build a coarse-grained dynamics." @default.
• W2139158220 created "2016-06-24" @default.
• W2139158220 creator A5041602248 @default.
• W2139158220 creator A5073013267 @default.
• W2139158220 date "2010-07-29" @default.
• W2139158220 modified "2023-10-10" @default.
• W2139158220 title "Effective dynamics using conditional expectations" @default.
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• W2139158220 doi "https://doi.org/10.1088/0951-7715/23/9/006" @default.
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