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Molecular Dynamics in the Multicanonical Ensemble: Equivalence of Wang-Landau Sampling, Statistical Temperature Molecular Dynamics, and Metadynamics

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arxiv 1401.6184 v2 pith:P3YGHJ44 submitted 2014-01-23 cond-mat.stat-mech cond-mat.mtrl-scicond-mat.softphysics.comp-ph

Molecular Dynamics in the Multicanonical Ensemble: Equivalence of Wang-Landau Sampling, Statistical Temperature Molecular Dynamics, and Metadynamics

classification cond-mat.stat-mech cond-mat.mtrl-scicond-mat.softphysics.comp-ph
keywords dynamicsmolecularstatisticaltemperaturemetadynamicswang-landauensembleformal
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We show direct formal relationship between the Wang-Landau iteration [PRL 86, 2050 (2001)], metadynamics [PNAS 99, 12562 (2002)] and statistical temperature molecular dynamics [PRL 97, 050601 (2006)], the major Monte Carlo and molecular dynamics work-horses for sampling from a generalized, multicanonical ensemble. We demonstrate that statistical temperature molecular dynamics (which is formally derived from the Wang-Landau method), augmented by the introduction of kernel updates of the statistical temperature, generates dynamics which are indistinguishable from a corresponding metadynamics simulation. We also show that the use of a Gaussian kernel significantly improves the performance of statistical temperature molecular dynamics, highlighting the practical benefits of this improved formal understanding.

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