Shear Viscosity in a Gluon Gas
Nuclear Theory
2008-11-26 v2 High Energy Physics - Phenomenology
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.
Keywords
Cite
@article{arxiv.0710.5719,
title = {Shear Viscosity in a Gluon Gas},
author = {Zhe Xu and Carsten Greiner},
journal= {arXiv preprint arXiv:0710.5719},
year = {2008}
}
Comments
4 pages, 2 figures, minor corrections, 3 references added, version published in PRL