Ruelle-Lanford functions for quantum spin systems

Details Ruelle-Lanford functions for quantum spin systems Ruelle-Lanford functions for quantum spin systems

2010-09-22

arxiv.org/abs/1009.4491v1

Physics

Mathematical Physics

22 pages

Scientific paper

We prove a large deviation principle for the expectation of macroscopic observables in quantum (and classical) Gibbs states. Our proof is based on Ruelle-Lanford functions and direct subadditivity arguments, as in the classical case, instead of relying on G\"artner-Ellis theorem, and cluster expansion or transfer operators as done in the quantum case. In this approach we recover, expand, and unify quantum (and classical) large deviation results for lattice Gibbs states. In the companion paper \cite{OR} we discuss the characterization of rate functions in terms of relative entropies.

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