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Virial expansion with Feynman diagrams

Virial expansion with Feynman diagrams We present a field theoretic method for the calculation of the second and third virial coefficients b 2 and b 3 of two-species fermions interacting via a contact interaction. The method is mostly analytic. We find a closed expression for b 3 in terms of the two- and three-body T matrices. We recover numerically, at unitarity, and also in the whole Bose-Einstein-condensate–BCS crossover, previous numerical results for the third virial coefficient b 3 . http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review A American Physical Society (APS)

Virial expansion with Feynman diagrams

Physical Review A , Volume 84 (5) – Nov 1, 2011
8 pages

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References (9)

Publisher
American Physical Society (APS)
Copyright
Copyright © 2011 The American Physical Society
ISSN
1094-1622
DOI
10.1103/PhysRevA.84.053633
Publisher site
See Article on Publisher Site

Abstract

We present a field theoretic method for the calculation of the second and third virial coefficients b 2 and b 3 of two-species fermions interacting via a contact interaction. The method is mostly analytic. We find a closed expression for b 3 in terms of the two- and three-body T matrices. We recover numerically, at unitarity, and also in the whole Bose-Einstein-condensate–BCS crossover, previous numerical results for the third virial coefficient b 3 .

Journal

Physical Review AAmerican Physical Society (APS)

Published: Nov 1, 2011

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