Theory of Excitations in Liquid Helium 4
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概要
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A modified "phonon-roton" model for liquid Helium II is proposed and is shown to be connected smoothly with the theory of Bose condensation. The method used is the direct extension of the method of "auxiliary variables" used by Bogolyubov and Zubarev, and is equivalent to that used by Bohm and Pines in the theory of the electron gas in metals. The phonon excitation is described in terms of the density operator, and the roton part by the socalled individual coordinates. The elimination of the kinematical interaction leads to the following model: The excitations for long wave length are described by phonons, and for short wave length by rotons, and the total number of excitations cannot exceed the total number of the particles. The thermal properties of this model is seen to agree with the experimental fact qualitatively.
- 社団法人日本物理学会の論文
- 1957-11-05