Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2011-07-11
J. Stat. Phys. 144, 554 (2011)
Physics
Condensed Matter
Statistical Mechanics
44 pages
Scientific paper
10.1007/s10955-011-0261-4
Tethering methods allow us to perform Monte Carlo simulations in ensembles with conserved quantities. Specifically, one couples a reservoir to the physical magnitude of interest, and studies the statistical ensemble where the total magnitude (system+reservoir) is conserved. The reservoir is actually integrated out, which leaves us with a fluctuation-dissipation formalism that allows us to recover the appropriate Helmholtz effective potential with great accuracy. These methods are demonstrating a remarkable flexibility. In fact, we illustrate two very different applications: hard spheres crystallization and the phase transition of the diluted antiferromagnet in a field (the physical realization of the random field Ising model). The tethered approach holds the promise to transform cartoon drawings of corrugated free-energy landscapes into real computations. Besides, it reduces the algorithmic dynamic slowing-down, probably because the conservation law holds non-locally.
Martin-Mayor Victor
Seoane B.
Yllanes David
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