Abstract
Thermodynamic Green's functions are used to examine the properties of a Bose gas whose particles repel one another, not necessarily weakly, for finite temperatures T > T0, in which T0 is the phase-transition point and T/n2/3 ⩽ 1. The excitation spectrum is deduced, together with the temperature dependence of the renormalized chemical potential and mass of the excitations.
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Geilikman, B.T., Kresin, V.Z. A nonideal Bose gas at high temperatures. Soviet Physics Journal 10, 10–11 (1967). https://doi.org/10.1007/BF00819973
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DOI: https://doi.org/10.1007/BF00819973