Condensed Matter Physics, 2015, vol. 18, No. 4, 43001
DOI:10.5488/CMP.18.43001
arXiv:1512.07742
Title:
First sound velocity in liquid 4He
Author(s):
 
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O.I. Hryhorchak
(Department for Theoretical Physics, Ivan Franko National University of Lviv, 12 Drahomanov St., 79005 Lviv, Ukraine)
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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 4He
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 4He .
Key words:
boson systems, liquid
PACS: 05.30.Jp, 67.25.-k, 43.35.+d, 62.60.+v,67.25.dt
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