Shear and bulk viscosity of the quark-gluon plasma with Gribov gluons and quasiparticle quarks

Abstract

In this study, we analyze the transport properties of the quark-gluon plasma (QGP), focusing on bulk (ζ) and shear (η) viscosities at vanishing chemical potential. To describe the QGP, we employ a quasiparticle model for quarks along with Gribov's prescription for gluons, which effectively captures nonperturbative dynamics. The Gribov parameter γG and the dynamical mass mg are obtained by solving the one-loop gap equation in the MS¯ renormalization scheme and further using lattice QCD data for the equation of state (EOS) of pure gluonic matter. The interaction between quarks and gluons is reflected in the quark quasimass mq, again obtained using lattice EOS data for (2+1)-flavor QCD. Our primary goal is to investigate the influence of quasiquarks on the transport coefficients of QGP. Interestingly, we find a substantial decrease in the scaled transport coefficients with rising temperatures within the range (1≤T/Tc≤3.5).