Conventional and Non-Conventional Condensations of Bosons
V.A. Zagrebnov
2025, v.31, Issue 3-4, 281-332
ABSTRACT
We present a review of some published results concerning evolution of the notion of (conventional ) Bose-Einstein condensation (BEC) predicted in Ideal Bose-Gas (IBG) in 1925. The first step forward was the notion of the conventional generalised BEC à la van den Berg-Lewis-Pulé discovered in the IBG and later in certain models with interactions in 1980s. The next development was a discovery of non-conventional condensation of bosons that occurs only due to interaction. Finally we discuss an example of (non-ideal) the Weakly Imperfect Bose-Gas (WIBG), where the conventional and non-conventional condensates may coexist
due to interaction.
doi:10.61102/1024-2953-mprf.2025.31.3-4.007
Keywords: Bose-Einstein statistics and condensation, conventional and non-conven- tional condensations, generalised condensations, energy-entropy balance and conden- sation, Weakly Imperfect Bose-gas (WIBG)
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