Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-10-03
Physics
High Energy Physics
High Energy Physics - Phenomenology
Oct 2011. 3 pages. 3 figures. Contribution to the proceedings of the 19th Particles and Nuclei International Conference (PANIC
Scientific paper
We study the ratio of bulk to shear viscosity in gluodynamics within a phenomenological quasiparticle model. We show that at large temperatures this ratio exhibits a quadratic dependence on the conformality measure as known from weak coupling perturbative QCD. In the region of the deconfinement transition, however, this dependence becomes linear as known from specific strongly coupled theories. The onset of the strong coupling behavior is located near the maximum of the scaled interaction measure. This qualitative behavior of the viscosity ratio is rather insensitive to details of the equation of state.
Bluhm Marcus
Kampfer Burkhard
Redlich Krzysztof
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