Theory of interacting bosons without anomalous propagators

H. Stolz

Physica A: Statistical Mechanics and its Applications, 1977, vol. 86, issue 1, 111-129

Abstract: A self-consistent theory of an interacting many-boson system is presented in the framework of the formalism of thermodynamic Green's functions without introducing anomalous propagators referring to the concept of a restricted average or any other symmetry-breaking assumption. Depending on the interaction, the theory comprises both phenomena of Bose-Einstein condensation and of boson pairing without a macroscopic occupation of the zero-momentum single-particle state. The results are discussed with reference to the problem of Bose-Einstein condensation of 4He II and to the phenomenon of exciton condensation and exciton pairing in highly excited semiconductors.

Date: 1977
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:86:y:1977:i:1:p:111-129

DOI: 10.1016/0378-4371(77)90065-6

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