Variational solution of a superfluidity model

N. Angelescu and A. Verbeure

Physica A: Statistical Mechanics and its Applications, 1995, vol. 216, issue 4, 386-396

Abstract: We derive, using the variational principle for the free energy, the solution of a model for superfluidity proposed in a previous paper. The solution has the phase diagram and the excitation spectrum expected from a superfluid. We draw the attention to the fact that the model is obtained, as compared with the Bogoliubov model, by a milder suppressing of interactions with the zero mode fluctuations, leading to the good spectral properties of superfluidity.

Date: 1995
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:216:y:1995:i:4:p:386-396

DOI: 10.1016/0378-4371(95)00078-L

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