99-218 J.-B. Bru, V. A. Zagrebnov
An exactly soluble model with non-conventional and non-extensive condensations (100K, LATeX 2e) Jun 4, 99
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Abstract. We present a new exactly soluble model which is motivated by the Michoel-Schr\"{o}der-Verbeure model [1] and our model [2]. It manifests two kinds of condensations which occur in two stages: for intermediate densities one has a non-conventional Bose condensation in the mode k=0 due to a diagonal perturbation of the Imperfect Bose Gas Hamiltonian, whereas for large densities it coexists with conventional (generalized, non-extensive) Bose-Einstein condensation corresponding to the standard mechanism of saturation.

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