Mean-field models with short-range correlations

Details Mean-field models with short-range correlations Mean-field models with short-range correlations

2011-12-02

arxiv.org/abs/1112.0395v3

EPL 97, 50008 (2012)

Physics

Condensed Matter

Statistical Mechanics

7 pages, 1 figure

Scientific paper

10.1209/0295-5075/97/50008

Given an arbitrary finite dimensional Hamiltonian H_0, we consider the model H=H_0+\Delta H, where \Delta H is a generic fully connected interaction. By using the strong law of large numbers we easily prove that, for all such models, a generalized Curie-Weiss mean-field equation holds. Unlike traditional mean-field models the term H_0 gives rise to short-range correlations and, furthermore, when H_0 has negative couplings, first-order phase transitions and inverse transition phenomena may take place even when only two-body interactions are present. The dependence from a non uniform external field and finite size effects are also explicitly calculated. Partially, these results were derived long ago by using min-max principles but remained almost unknown.

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