Dilute resonating gases and the third virial coefficient

Abstract

We study dilute gases with short range interactions and large two-body scattering lengths. At temperatures between the condensation temperature and the scale set by therange of the potential there is a high degree of universality. The first two terms in the expansion of thermodynamic functions in powers of the fugacity $z$, which measures the diluteness of the system, are determined by the scattering length only. The term proportional to $z^3$ depends only on one new parameter describing the three-body physics. We compute the third term of the expansion and show that, for many values of this new parameter, the $z^3$ term may be the dominant one.

11 pages, 4 figures included

References in corpus (3)

• Resonance superfluidity in a quantum degenerate Fermi gas
• Three-body recombination into deep bound states in a Bose gas with large scattering length
• The Dilute Bose-Einstein Condensate with Large Scattering Length

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