Condensed Matter Physics (Dec 2015)

First sound velocity in liquid ^{4}He

  • O.I. Hryhorchak

DOI
https://doi.org/10.5488/CMP.18.43001
Journal volume & issue
Vol. 18, no. 4
p. 43001

Abstract

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Based on the many-boson system structure factor, which takes into account three- and four-particle direct correlations, there was found the first sound velocity temperature behaviour in liquid ^{4}He in the post-RPA approximation. The expression received for the sound velocity matches with the well-known results in both low and high temperature limits. The results of this paper can be used to analyze the contributions of three- and four-particle correlations into thermodynamic and structural features of liquid ^{4}He.

Keywords