Effective Mass of Atom and Excitation Spectrum in Liquid Helium-4 at T=0 K
A. A. Rovenchak
Abstract
A self-consistent approach is applied for the calculations within the two-time temperature Green functions formalism in the random phase approximation. The effective mass of He4 atom is computed as m*=1.58 m. The excitation spectrum is found to be in a satisfactory agreement with the experiment. The sound velocity is calculated as 230 m/s. The temperature of the Bose-condensation with the effective mass taken into consideration is estimated as 1.99 K.
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