Abstract
The theory of a nonideal gas developed by N. N. Bogoliubov is applied for a semiclassical description of nonlinear dynamics of Bose condensate density. Analytical calculations lead to temperature dependence of heat capacity Cv typical of superfluid 4He at temperatures below and above the superconducting transition temperature Tc except for the interval 1.6 K<T<2.2 K.
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