Effective kinetic description of the expanding overoccupied Glasma

Abstract

We report on a numerical study of the Boltzmann equation including $2\leftrightarrow 2$ scatterings of gluons and quarks in an overoccupied Glasma undergoing longitudinal expansion. We find that when a cascade of gluon number to the infrared occurs, corresponding to an infrared enhancement analogous to a transient Bose-Einstein condensate, gluon distributions qualitatively reproduce the results of classical-statistical simulations for the expanding Glasma. These include key features of the distributions that are not anticipated in the "bottom-up" thermalization scenario. We also find that quark distributions, like those of gluons, satisfy self-similar scaling distributions in the overoccupied Glasma. We discuss the implications of these results for a deeper understanding of the self-similarity and universality of parton distributions in the Glasma.

34 pages, 21 figures; version accepted in PRD

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• Universal quark to gluon ratio in medium-induced parton cascade
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• Prompt, pre-equilibrium, and thermal photons in relativistic nuclear collisions
• Nonequilibrium quark production in the expanding QCD plasma
• Prescaling relaxation to nonthermal attractors
• Far-from-equilibrium attractors with Full Relativistic Boltzmann approach in 3+1 D: moments of distribution function and anisotropic flows $v_n$
• Fluctuations in non-ideal pion gas with dynamically fixed particle number
• Direct Photons in Hydrodynamic Modeling of Relativistic Nuclear Collisions
• Volume effects on the QCD critical end point from thermal fluctuations within the super statistics framework
• Adiabatic Hydrodynamization and the Emergence of Attractors: a Unified Description of Hydrodynamization in Kinetic Theory
• Angular mode expansion of the Boltzmann equation in the small-angle approximation
• How brightly does the Glasma shine? Photon production off-equilibrium
• Nonequilibrium quark production in the expanding QCD plasma
• Revisiting the Gluon Spectrum in the Boost-Invariant Glasma from a Semi-Analytic Approach
• Massless quark production in chromoelectric field with back reaction
• Adiabatic hydrodynamization and quasinormal modes of nonthermal attractors
• Charge and isospin fluctuations in a non-ideal pion gas with dynamically fixed particle number