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

  • H. Gould
  • V. K. Wong

Abstract

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.

Keywords

Bose System Density Response Function Dynamic Structure Function Elementary Excitation Spectrum Virtual Phonon 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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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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