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Shear Viscosity in a Gluon Gas

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arxiv 0710.5719 v2 pith:EZPNT7TL submitted 2007-10-30 nucl-th hep-ph

Zhe Xu , Carsten Greiner This is my paper · ORCID
classification nucl-thhep-ph
keywords gluonshearviscosityalphabremsstrahlungpqcdcalculatecoefficient
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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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  1. Shear Viscosity of Collider-Produced QCD Matter II: Comparing a Multi-Component Chapman-Enskog Framework with AMPT in Full Equilibrium

    nucl-th 2025-01 conditional novelty 4.0 of 10

    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.

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