BoseEinstein Condensation in a Bose Gas
under Cooling Conditions

R. B. Saptsov

Landau Institute for Theoretical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432 Russia
e-mail: saptsov@itp.ac.ru

Received December 28, 2006

Abstract—The mechanism of condensation of a weakly nonideal Bose gas into a superfluid state (described in
[1]) is analyzed by taking into account strong density fluctuations. The probability of occurrence of an optimal
fluctuation leading to the formation of a superfluid phase is calculated. The relationship between the results of
this study and the analysis presented in [1] is discussed.

PACS numbers: 05.30.-d, 03.75.Nt, 64.60.Qb

DOI: 10.1134/S1063776107090130

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