Virial expansion with Feynman diagrams
Quantum Gases
2013-05-29 v1 Atomic Physics
Abstract
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.
Keywords
Cite
@article{arxiv.1109.4794,
title = {Virial expansion with Feynman diagrams},
author = {Xavier Leyronas},
journal= {arXiv preprint arXiv:1109.4794},
year = {2013}
}