Shear viscosity in a gluon gas

被引：118
|
作者：
Xu, Zhe [1 ]
Greiner, Carsten [1 ]
机构：
[1] Univ Frankfurt, Inst Theoret Phys, D-60438 Frankfurt, Germany
来源：
PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 17期
关键词：
D O I：
10.1103/PhysRevLett.100.172301
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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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页数：4
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