Resolving the puzzle of sound propagation in liquid helium at low temperatures

  title={Resolving the puzzle of sound propagation in liquid helium at low temperatures},
  author={Tony C. Scott and Konstantin G. Zloshchastiev},
  journal={arXiv: Quantum Gases},
Experimental data suggests that, at temperatures below 1 K, the pressure in liquid helium has a cubic dependence on density. Thus the speed of sound scales as a cubic root of pressure. Near a critical pressure point, this speed approaches zero whereby the critical pressure is negative, thus indicating a cavitation instability regime. We demonstrate that to explain this dependence, one has to view liquid helium as a mixture of three quantum Bose liquids: dilute (Gross-Pitaevskii-type) Bose… 

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