Bogoliubov-Zubarev Description of a Weakly Interacting Bose Gas
- 1 July 1972
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 6 (1) , 498-505
- https://doi.org/10.1103/physreva.6.498
Abstract
Bogoliubov-Zubarev's exact transformation, specific to a weakly interacting Bose gas having a condensate, yields a Hamiltonian describing a gas of interacting excitations. The non-Hermiticity of the Hamiltonian arises from the nonorthogonality of the physical states; it has some significant consequences. The excitation spectrum is gapless in every approximation; the lowest-order correction is evaluated numerically and shown to be small. It is concluded that the approach presents a prospective method for a quantitative description of the weakly interacting Bose gas.Keywords
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