Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2010-08-13
J.Phys.G38:015004,2011
Physics
Nuclear Physics
Nuclear Theory
11 pages, 8 figures: version #2 contains some revisions and added references to clarify relationship to previously published w
Scientific paper
10.1088/0954-3899/38/1/015004
Among the key features of hot and dense QCD matter produced in ultra-relativistic heavy-ion collisions at RHIC is its very low shear viscosity, indicative of the properties of a near-ideal fluid, and a large opacity demonstrated by jet energy loss measurements. In this work, we utilize a microscopic transport model based on the Boltzmann equation with quark and gluon degrees of freedom and cross sections calculated from perturbative Quantum Chromodynamics to simulate an ideal Quark-Gluon-Plasma in full thermal and chemical equilibrium. We then use the Kubo formalism to calculate the shear viscosity to entropy density ratio of the medium as a function of temperature and system composition. One of our key results is that the shear viscosity over entropy-density ratio $\eta/s$ becomes invariant to the chemical composition of the system when plotted as a function of energy-density instead of temperature.
Bass Steffen A.
Demir Nasser S.
III John Fuini
Srivastava Dinesh K.
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