Shear Viscosity of a Unitary Fermi Gas

We present an ab initio determination of the shear viscosity eta of the unitary Fermi gas, based on finite temperature quantum Monte Carlo calculations and the Kubo linear-response formalism. We determine the temperature dependence of the shear viscosity-to-entropy density ratio eta/s. The minimum of eta/s appears to be located above the critical temperature for the superfluid-to-normal phase transition with the most probable value being (eta/s)(min) approximate to 0.2 (h) over bar /k(B), which is close the Kovtun-Son-Starinets universal value (h) over bar/(4 pi k(B)).