Abstract
The present paper, based on an obvious generalization of the formalism of Belyaev [1,5], supplements the work of Belyaev [2] for the case T ≠ 0. The temperature dependence of the quasiparticle excitation and damping spectrum, the ground state energy, and the thermodynamic quantities is determined to second order in the gas-density parameter using the constant amplitude approximation. In the limiting case of free particles, the results are obtained for an ideal gas with T < T0, where T0 is the condensation temperature of the ideal Bose gas.
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References
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In conclusion I wish to thank B. T. Geilikman, under whose supervision this work was performed.
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Klyatskin, V.I. A nonideal Bose gas at finite temperatures. Soviet Physics Journal 9, 100–104 (1966). https://doi.org/10.1007/BF00818506
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DOI: https://doi.org/10.1007/BF00818506