Virial expansion with Feynman diagrams

Details Virial expansion with Feynman diagrams Virial expansion with Feynman diagrams

2011-09-22

arxiv.org/abs/1109.4794v1

Physics

Condensed Matter

Quantum Gases

Scientific paper

We present a field theoretic method for the calculation of the second and third virial coefficients b2 and b3 of 2-species fermions interacting via a contact interaction. The method is mostly analytic. We find a closed expression for b3 in terms of the 2 and 3-body T-matrices. We recover numerically, at unitarity, and also in the whole BEC-BCS crossover, previous numerical results for the third virial coefficient b3.

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