Chemical Equilibration in Weakly Coupled QCD

Abstract

We study thermalization, hydrodynamization, and chemical equilibration in out-of-equilibrium Quark-Gluon Plasma starting from various initial conditions using QCD effective kinetic theory, valid at weak coupling. In non-expanding systems gauge bosons rapidly lose information of the initial state and achieve kinetic equilibrium among themselves, while fermions approach the equilibrium distribution only at later time. In systems undergoing rapid longitudinal expansion, both gluons and quarks are kept away from equilibrium by the expansion, but the evolution is well described by fluid dynamics even before local thermal equilibrium is reached. For realistic couplings we determine the ordering between the separate hydrodynamization, chemical equilibration and thermalization time scales to be ${\tau }_{\text{hydro}}<{\tau }_{\text{chem}}<{\tau }_{\text{therm}}$.

11 pages, 9 figures, see also our companion paper arXiv:1811.03040 ; v2 minor changes, published version

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• The Color Glass Condensate
• Some Features of the Glasma
• Holography and colliding gravitational shock waves in asymptotically AdS_5 spacetime
• Second order hydrodynamic coefficients from kinetic theory
• Approach to equilibrium in weakly coupled nonabelian plasmas
• Turbulence in nonabelian gauge theory
• Statistical Model Predictions for Particle Ratios at sqrt(s_NN) = 5.5 TeV
• Fermionic Collective Modes of an Anisotropic Quark-Gluon Plasma
• Low Mass Thermal Dilepton Production at NLO in a Weakly Coupled Quark-Gluon Plasma
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