Hadronic Shear Viscosity: A Comparison between the Green-Kubo and Chapmann Enskog Methods

A detailed comparison between two methods to calculate shear viscosity is presented. We choose two systems in this comparison which are massless particles with current algebra cross section and a mixture comprised of pions with rho resonances. The two methods involved are the Green-Kubo method, applied using the Ultrarelativistic Quantum Molecular Dynamics (UrQMD) model to simulate the hadronic medium, and the Chapmann-Enskog method.