Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2003-08-18
Physics
Condensed Matter
Statistical Mechanics
28 pages, (LaTeX); a review article to appear in Journal of Molecular Graphics and Modelling
Scientific paper
In complex systems with many degrees of freedom such as spin glass and biomolecular systems, conventional simulations in canonical ensemble suffer from the quasi-ergodicity problem. A simulation in generalized ensemble performs a random walk in potential energy space and overcomes this difficulty. From only one simulation run, one can obtain canonical-ensemble averages of physical quantities as functions of temperature by the single-histogram and/or multiple-histogram reweighting techniques. In this article we review the generalized-ensemble algorithms. Three well-known methods, namely, multicanonical algorithm, simulated tempering, and replica-exchange method, are described first. Both Monte Carlo and molecular dynamics versions of the algorithms are given. We then present five new generalized-ensemble algorithms which are extensions of the above methods.
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