Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-10-18
Nucl.Phys.A774:869-872,2006; Eur.Phys.J.A29:43-47,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
Includes new results. 8 pages, 1 figure, based on proceedings contributions at "Quark Matter 2005" conference in Budapest, Hun
Scientific paper
10.1016/j.nuclphysa.2006.06.154
We argue that isotropization and, consequently, thermalization of the system of gluons and quarks produced in an ultrarelativistic heavy ion collision does not follow from Feynman diagram analysis to any order in the coupling constant. We conclude that the apparent thermalization of quarks and gluons, leading to success of perfect fluid hydrodynamics in describing heavy ion collisions at RHIC, can only be attributed to the non-perturbative QCD effects not captured by Feynman diagrams. We proceed by modeling these non-pertrubative thermalization effects using viscous hydrodynamics. We point out that matching Color Glass Condensate inital conditions with viscous hydrodynamics leads to continuous evolution of all components of energy-momentum tensor and, unlike the case of ideal hydrodynamics, does not give a discontinuity in the longitudinal pressure. An important consequence of such a matching is a relationship between the thermalization time and shear viscosity: we observe that small viscosity leads to short thermalization time.
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