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The RPA-SPA approximation to level densities

Functional integral techniques are applied to the problem of level densities for interacting Fermi systems. Thermal and small-amplitude quantal fluctuations are retained in the partition function. Validity and limitations of the approximation are explored on solvable models for which the mean-field...

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Bibliographic Details
Published in:Annals of physics 1991-03, Vol.206 (2), p.409-439
Main Authors: Puddu, G, Bortignon, P.F, Broglia, R.A
Format: Article
Language:English
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Summary:Functional integral techniques are applied to the problem of level densities for interacting Fermi systems. Thermal and small-amplitude quantal fluctuations are retained in the partition function. Validity and limitations of the approximation are explored on solvable models for which the mean-field approximation displays phase transitions. The exact results are reproduced to a high level of accuracy.
ISSN:0003-4916
1096-035X
DOI:10.1016/0003-4916(91)90006-T