Nonequilibrium quark production in the expanding QCD plasma

Abstract

We perform real-time lattice simulations of nonequilibrium quark production in the longitudinally expanding QCD plasma. Starting from a highly occupied gluonic state with vacuum quark sector, we extract the time evolution of quark and gluon number densities per unit transverse area and rapidity. The total quark number shows after an initial rapid increase an almost linear growth with time. Remarkably, this growth rate appears to be consistent with a simple kinetic theory estimate involving only two-to-two scattering processes in small-angle approximation. This extends previous findings about the role of two-to-two scatterings for purely gluonic dynamics in accordance with the early stages of the bottom-up thermalization scenario.

33 pages, 23 figures, published version

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• Universal quark to gluon ratio in medium-induced parton cascade
• Schwinger pair production and string breaking in non-Abelian gauge theory from real-time lattice improved Hamiltonians
• Some Aspects of the Theory of Heavy Ion Collisions
• Real-time lattice gauge theory actions: unitarity, convergence, and path integral contour deformations
• Heavy flavor angular correlations as a direct probe of the glasma
• Multiparticle Production at Mid-Rapidity in the Color-Glass Condensate
• The impact of glasma on heavy flavor azimuthal correlations and spectra
• Nonequilibrium axial charge production in expanding glasma flux tubes
• Gauge invariant canonical symplectic algorithms for real-time lattice strong-field quantum electrodynamics
• Nonequilibrium quark production in the expanding QCD plasma
• Gauge ambiguity of the quark spectrum in the Color Glass Condensate