Hydrodynamic Theory of Fourth Sound in a Moving Superfluid — A Discussion of Size Effects

  • David J. Bergman


A previous discussion of fourth sound in a moving superfluid is extended to include a detailed estimate of size effects. Comparison with experiment still shows a considerable disagreement. This might indicate the existence of relaxation phenomena on a time scale of 10−2 –102 sec. which have not yet been observed.


Helium Atom Detailed Estimate Helium Density Superfluid Density Fourth Sound 
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Copyright information

© Plenum Press, New York 1975

Authors and Affiliations

  • David J. Bergman
    • 1
    • 2
  1. 1.Bell LaboratoriesMurray HillUSA
  2. 2.Physics DepartmentTel-Aviv UniversityTel-AvivIsrael

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