Abstract
In this study we model early time dynamics of relativistic heavy ion collisions by an initial color-electric field which then decays to a plasma by the Schwinger mechanism. The dynamics of the many particles system produced by the decay is described by relativistic kinetic theory, taking into account the backreaction on the color field by solving self-consistently the kinetic and the field equations. Our main results concern isotropization and thermalization for a 1+1D expanding geometry. In case of small η / s ( η / s ≲ 0.3) we find τ isotropization ≈ 0.8 fm/c and τ thermalization ≈ 1 fm/c in agreement with the common lore of hydrodynamics.
Highlights
According to the general understanding of relativistic heavy ion collisions, in the overlap region of the two colliding nuclei a peculiar ensemble of longitudinal color fields named the Glasma is produced soon after the collision
We assume that initially the system consists of a classical color field only, which decays according to the Schwinger mechanism into a plasma of quarks and gluons; the dynamics of the system particles+field is studied self-consistently by coupling evolution equations for distribution function and field
The main assumptions of the model are that in the initial condition a color electric field is present, which decays into particle quanta by the Schwinger mechanism; the equations of motion for the classical fields are assumed to be the Maxwell equations, in which we introduce the backreaction to the field due to polarization and conduction currents
Summary
According to the general understanding of relativistic heavy ion collisions, in the overlap region of the two colliding nuclei a peculiar ensemble of (almost) longitudinal color fields named the Glasma is produced soon after the collision. In this talk we present one possible approach to this problem, presenting our recent results about modelling early time dynamics of relativistic heavy ion collisions by coupling the dynamics of the initial color field to that of the quark-gluon plasma.
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