Shear Viscosity in a Gluon Gas

Details Shear Viscosity in a Gluon Gas Shear Viscosity in a Gluon Gas

2007-10-30

arxiv.org/abs/0710.5719v2

Phys.Rev.Lett.100:172301,2008

Physics

Nuclear Physics

Nuclear Theory

4 pages, 2 figures, minor corrections, 3 references added, version published in PRL

Scientific paper

10.1103/PhysRevLett.100.172301

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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