Abstract
The dilute Fermi gas at unitarity is scale invariant and its bulk viscosity vanishes. We compute, in the high temperature limit, the leading contribution to the bulk viscosity when the scattering length is not infinite. A measure of scale breaking is provided by the ratio , where is the pressure and is the energy density. At high temperature this ratio scales as , where is the fugacity, is the thermal wavelength, and is the scattering length. We show that the bulk viscosity scales as the second power of this parameter, .
- Received 18 June 2013
DOI:https://doi.org/10.1103/PhysRevLett.111.120603
© 2013 American Physical Society