- 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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