Classical Limits of Euclidean Gibbs States for Quantum Lattice Models

Details Classical Limits of Euclidean Gibbs States for Quantum Lattice Models Classical Limits of Euclidean Gibbs States for Quantum Lattice Models

1998-12-18

arxiv.org/abs/math-ph/9812017v1

Physics

Mathematical Physics

23 pages, LaTeX, submitted to Letters in Mathematical Physics

Scientific paper

Models of quantum and classical particles on the d-dimensional cubic lattice with pair interparticle interactions are considered. The classical model is obtained from the corresponding quantum one when the reduced physical mass of the particle tends to infinity. For these models, it is proposed to define the convergence of the Euclidean Gibbs states, when the reduced mass tends to infinity, by the weak convergence of the corresponding Gibbs specifications, determined by conditional Gibbs measures. In fact it is proved that all conditional Gibbs measures of the quantum model weakly converge to the conditional Gibbs measures of the classical model. A similar convergence of the periodic Gibbs measures and, as a result, of the order parameters, for such models with the pair interactions possessing the translation invariance, has also been proven.

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