Abstract
An extension of the standard hydrodynamical equations for superfluid helium atT=0 is discussed. Its relation with Feynman wave functions and the well-known Gross-Pitaevskii treatment is elucidated. Finally, a discussion of the free boundary of He II is carried out and the surface tension computed on the basis of a simple approximation scheme. The result is 0.56 dyne/cm against about 0.35 dyne/cm experimental value.
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Regge, T. Free boundary of He II and Feynman wave functions. J Low Temp Phys 9, 123–133 (1972). https://doi.org/10.1007/BF00655491
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DOI: https://doi.org/10.1007/BF00655491