On the nature of the fourth sound

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The density-density correlation function of He II bounded by solid walls is calculated in the hydrodynamic region. The migration of its poles as a function of the resistance parameter is investigated, and it is found that the fourth-sound pole can only be related to the first-sound pole far enough (ρ{variant}s0/ρ{variant}0>1/9) from the critical temperature. Otherwise, it arises from a mixture of the first- and second-sound poles. The contributions of poles to the sum rules are also discussed.

Original languageEnglish
Pages (from-to)509-518
Number of pages10
JournalJournal of Low Temperature Physics
Issue number3-4
Publication statusPublished - May 1 1973


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

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