A three-component Chapman-Enskog model with running coupling and screening mass predicts higher shear viscosity when quarks are included and a decrease of eta/s as the QGP cools.
Shear Viscosity in a Gluon Gas
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abstract
The relation of the shear viscosity coefficient to the recently introduced transport rate is derived within relativistic kinetic theory. We calculate the shear viscosity over entropy ratio \eta/s for a gluon gas, which involves elastic gg-> gg perturbative QCD (PQCD) scatterings as well as inelastic gg<->ggg PQCD bremsstrahlung. For \alpha_s=0.3 we find \eta/s=0.13 and for \alpha_s=0.6, \eta/s=0.076. The small \eta/s values, which suggest strongly coupled systems, are due to the gluon bremsstrahlung incorporated.
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Shear Viscosity of Collider-Produced QCD Matter II: Comparing a Multi-Component Chapman-Enskog Framework with AMPT in Full Equilibrium
A three-component Chapman-Enskog model with running coupling and screening mass predicts higher shear viscosity when quarks are included and a decrease of eta/s as the QGP cools.