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- W2073482387 abstract "We present the description of thermodynamic properties of a Bose gas by considering the hierarchy of equations satisfied by imaginary-time Green functions. In the case of an ideal gas the appearance of the off-diagonal long-range order (presence of condensate) is derived in a particularly simple way. The simplicity of the analysis persists at the level of the mean-field theory. Using Kac's scaling of the repulsive binary potential we then determine asymptotic corrections to the mean-field theory for thermodynamic states far from the region of the mean-field condensation. Our predictions are in accordance with rigorous results obtained previously, whereas the Hartree-Fock approximation is shown to neglect a whole class of equally important contributions." @default.
- W2073482387 created "2016-06-24" @default.
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- W2073482387 date "2011-10-17" @default.
- W2073482387 modified "2023-09-25" @default.
- W2073482387 title "Interacting Bose gas: Mean field and fluctuations revisited" @default.
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- W2073482387 doi "https://doi.org/10.1103/physreve.84.041122" @default.
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