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 ${\mu }_B$ from the dynamical quasiparticle model (DQPM) that is matched to reproduce the equation of state of the partonic system above the deconfinement temperature $T_c$ from lattice QCD. To this aim we calculate the collisional widths for the partonic degrees of freedom at finite $T$ and ${\mu }_B$ in the time-like sector and conclude that the quasiparticle limit holds sufficiently well. Furthermore, the ratio of shear viscosity $\eta$ over entropy density $s$, i.e. $\eta /s$, is evaluated using these collisional widths and are compared to lQCD calculations for ${\mu }_B$ = 0 as well. We find that the ratio $\eta /s$ 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 $\eta /s$ with the baryon chemical ${\mu }_B$ as a function of the scaled temperature $T/T_c({\mu }_B)$.

arXiv comment4 pages, 1 figure,to be published in the Proceedings of the 18th International Conference on Strangeness in Quark Matter (SQM 2019), June 9-15 2019, Bari, Italy

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Cited by in corpus (1)

• Properties of the QGP created in heavy-ion collisions