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Z. Idziaszek, M. Gajda, P. Navez, M. Wilkens, and K. Rzazewski
Fluctuations of the weakly interacting Bose-Einstein condensate
Phys. Rev. Lett. 82 (1999) 4376-4379


    We consider the role of weak interatomic interactions on the fluctuations of the number of condensed atoms within canonical and microcanonical ensembles. Unlike the corresponding case of the ideal gas this is not a clean, well-defined problem of mathematical physics. Two related reasons are the following: there is no unique way of defining the condensate fraction of the interacting system and no exact energy levels of the interacting system are known.

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