Abstract
A model of interacting quantum particles performing one-dimensional anharmonic oscillations around their equilibrium positions which form a lattice ℤd is considered. For this model, it is proved that the set of tempered Euclidean Gibbs measures is a singleton provided the particle mass is less than a certain bound m *, which is independent of the temperature β−1. This settles a problem that was open for a long time and is an essential improvement of a similar result proved before by the same authors [5], where the bound m * depended on β in such a way that \({{m_{{\ast}} (\beta) \rightarrow 0}}\) as \({{\beta \rightarrow +\infty}}\).
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Albeverio, S., Kondratiev, Y., Kozitsky, Y. et al. Small Mass Implies Uniqueness of Gibbs States of a Quantum Crystal. Commun. Math. Phys. 241, 69–90 (2003). https://doi.org/10.1007/s00220-003-0923-4
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DOI: https://doi.org/10.1007/s00220-003-0923-4