DOI: https://doi.org/10.30970/jps.03.239
THE BOGOLIUBOV WEAKLY IMPERFECT BOSE-GAS
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Journal of Physical Studies 3(3), 239–251 (1999)
DOI: https://doi.org/10.30970/jps.03.239 THE BOGOLIUBOV WEAKLY IMPERFECT BOSE-GAS |
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Valentin A. Zagrebnov
Centre de Physique Théorique (Unité Propre de Recherche 7061),
Université de la Méditerranée
(Aix-Marseille II)
CNRS - Luminy - Case 907,
13288 Marseille, Cedex 09, France
It is shown that the condensation in the Bogoliubov Weakly Imperfect Bose–Gas (WIBG) may appear in two stages. If the interaction is such that the pressure of the WIBG does not coincide with the pressure of the Perfect Bose–Gas (PBG), then the WIBG may manifest two kinds of condensations: a ıt non–conventional} condensation in the zero–mode due to the interaction (the first stage) and a ıt conventional} (generalized of type I) Bose–Einstein condensation in modes next to the zero–mode due to the particle density saturation (the second stage).