Transport Coefficients of Hot and Dense Matter

Abstract

We present calculations for the shear viscosity of the hot and dense quark-gluon plasma (QGP) using the partonic scattering cross sections as a function of temperature T and baryon chemical potential from the dynamical quasiparticle model (DQPM) that is matched to reproduce the equation of state of the partonic system above the deconfinement temperature from lattice QCD. To this aim we calculate the collisional widths for the partonic degrees of freedom at finite T and in the time-like sector and conclude that the quasiparticle limit holds sufficiently well. Furthermore, the ratio of shear viscosity over entropy density s, i.e., is evaluated using these collisional widths and are compared to lQCD calculations for = 0 as well. We find that the ratio is in agreement with the results of calculations within the original DQPM on the basis of the Kubo formalism. Furthermore, there is only a very modest change of with the baryon chemical as a function of the scaled temperature.