Extraction of shear viscosity in stationary states of relativistic   particle systems
  Starting from a classical picture of shear viscosity we construct a stationary velocity gradient in a microscopic parton cascade. Employing the Navier-Stokes ansatz we extract the shear viscosity coefficient $\eta$. For elastic isotropic scatterings we find an excellent agreement with the analytic values. This confirms the applicability of this method. Furthermore for both elastic and inelastic scatterings with pQCD based cross sections we extract the shear viscosity coefficient $\eta$ for a pure gluonic system and find a good agreement with already published calculations. 
Felix Reining, Ioannis Bouras, Andrej El, Chistian Wesp, Zhe Xu and   Carsten Greiner
hep-th hep-ph nucl-th