Long-Wavelength Excitations in a Bose Gas And Liquid He II at T = 0

  • H. Gould
  • V. K. Wong


There are many assumptions that have been made, both in theoretical1 and experimental2 investigations, about the nature of the long-wavelength excitations of liquid He II. As an example, it is common to assume that the excitation spectrum ω(k) and various structure functions S(k) can be expanded in a power series in the wave vector k. A theoretical justification of the various assumptions is an important problem, but in the absence of a tractable microscopic theory of a strongly interacting Bose system we must look for other ways to test these assumptions. One way is by a qualitative analysis coupled with the use of plausible sum rule arguments. Another way is by a rigorous microscopic analysis of a solvable model of a Bose gas.


Bose System Density Response Function Dynamic Structure Function Elementary Excitation Spectrum Virtual Phonon 
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Copyright information

© Springer Science+Business Media New York 1974

Authors and Affiliations

  • H. Gould
    • 1
  • V. K. Wong
    • 2
  1. 1.Department of PhysicsClark UniversityWorcesterUSA
  2. 2.Department of PhysicsUniversity of MichiganAnn ArborUSA

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