Condensation and superfluidity of Bose gas
arXiv:1902.02218 · doi:10.1016/j.physb.2020.412017
Abstract
We perform the comprehensive comparison of properties of the condensate and superfluid densities for the -component three-dimensional Bose gas with the symmetric inter- and intraspecies short-range interaction between particles. In particular, based on the large- expansion approach for many-boson systems we obtain general expression for density of the superfluid component that at very low temperatures reproduce the well-know Landau's formula and non-trivially includes the thermal fluctuations in the finite-temperature region, and compare it to the condensate density calculated previously. The numerically evaluated temperature dependencies are in a qualitatively good agreement with the results of Monte Carlo simulations.
6 pages, 3 figures; false statement about the nature of critical exponent for the superfluid density was clarified
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