Issue 19, 2020

Correlation effects in parallel tempering and the role of the swapping frequency

Abstract

In this work, I investigate the effect of the swapping time frequency in parallel tempering (or replica exchange molecular dynamics, REMD) on the sampled equilibrium distributions at the different temperatures. By means of a simple deterministic Ising model originally introduced by M. Creutz (Phys. Rev. Lett., 1983, 50, 1411) I show that high frequency swaps can induce a systematic bias on the sampled REMD equilibrium distributions. The origin of this failure is ascribed to correlation effects among close temperature configurations used to evaluate REMD swapping probabilities. These results should serve as a monitor for using too frequent swapping attempts in parallel tempering simulations of generic Hamiltonians, including the ones used in atomistic simulations.

Graphical abstract: Correlation effects in parallel tempering and the role of the swapping frequency

Article information

Article type
Paper
Submitted
16 Dec. 2019
Accepted
15 Apr. 2020
First published
15 Apr. 2020

Phys. Chem. Chem. Phys., 2020,22, 10802-10806

Correlation effects in parallel tempering and the role of the swapping frequency

I. Tavernelli, Phys. Chem. Chem. Phys., 2020, 22, 10802 DOI: 10.1039/C9CP06772H

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