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We were informed recently that a diagramatic calculation of b2 had been done in
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) [ 6 ] R . Combescot , X . Leyronas
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 .
Physical Review A – American Physical Society (APS)
Published: Nov 1, 2011
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