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C$^*$-algebraic approach to the Bose-Hubbard model
Stefan Adams and Tony Dorlas
We give a new derivation of the variational formula for the pressure of the long-range-hopping Bose-Hubbard model, which was first proved in . The proof is analogous to that of a theorem on noncommutative large deviations introduced by Petz, Raggio and Verbeure  and could similarly be extended to more general Bose system of mean-field type. We apply this formalism to prove Bose-Einstein condensation for the case of small coupling.