Frank R. Libsch, Takatoshi Tsujimura
Active Matrix Liquid Crystal Displays Technology and Applications 1997
Paper
Phonon dispersion in liquid He II
Abstract
The eigenfunctions of the linearized collision operator for the phonons in superfluid helium are determined numerically. The calculated sound velocity is in quantitative agreement with experimental data in a wide frequency and temperature range if an anomalous dispersion γ=-1038 in cgs units is used. © 1975 The American Physical Society.
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