99-215 J.-B. Bru, V. A. Zagrebnov

On condensations in the Bogoliubov Weakly Imperfect Bose-Gas (157K, LATeX 2e) Jun 4, 99

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Abstract. We show that the condensation in the Bogoliubov Weakly Imperfect Bose-Gas (WIBG) can 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 manifests two kinds of condensations: a non-conventional condensation in the zero-mode due to the interaction (in the first stage) and a conventional (generalized: type I) Bose-Einstein condensation in modes next to the zero-mode due to the particle density saturation (in the second stage).

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