Bogoliubov-Zubarev description of a weakly interacting Bose gas

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14 Scopus citations


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.

Original languageEnglish
Pages (from-to)498-505
Number of pages8
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number1
StatePublished - 1972

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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