Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2012-02-23
Physics
Nuclear Physics
Nuclear Theory
11 pages, 6 figures, two column, revtex4-1
Scientific paper
The bulk and shear viscosities ($\eta$ and $\zeta$) have been studied for quark-gluon-plasma produced in relativistic heavy ion collisions within semi-classical transport theory in a recently proposed quasi-particle model of (2+1)-flavor lattice QCD equation of state. These transport parameters have been found to be highly sensitive to the interactions present in hot QCD. Contributions to the transport coefficients from both the gluonic sector and the matter sector have been investigated. The matter sector is found to be significantly dominating over the gluonic sector, in the case of both $\eta$ and $\zeta$. The temperature dependences of the quantities, $\zeta/{\mathcal S}$, and $\zeta/\eta$ indicate a sharply rising trend for the $\zeta$ closer to QCD transition temperature. Both $\eta$ and $\zeta$ are shown to be equally significant for the temperatures that are accessible in the relativistic heavy ion collision experiments, and hence play crucial role while investigating the properties of the quark-gluon plasma.
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