Speaker
Mrs
Lucia Oliva
(INFN-Laboratori Nazionali del Sud, University of Catania)
Description
In this study we model early times dynamics of relativistic heavy ion collisions by an initial color electric field which then decays to a plasma by the Schwinger mechanism, coupling the dynamical evolution of the initial color field to the dynamics of the many particles system produced by the decay. The latter is described by relativistic kinetic theory in which we fix the ratio $eta/s$ rather than insisting on specific microscopic processes, and the backreaction on the color field is taken into account by solving self-consistently the kinetic and the field equations. Within a single self-consistent calculation scheme we address the problems of isotropization and thermalization of the quark-gluon plasma produced by the field decay, as well as the quark-gluon plasma formation time and its chemical equilibration, both for 1+1D and 3+1D expanding geometry. We find that regardless of the viscosity of the produced plasma, longitudinal pressure becomes positive within 0.2 fm/c. The initial color electric field decays within 1 fm/c; however in the case $eta/s$ is large plasma oscillations appear and affect the entire time evolution of the system. In case of small $eta/s$ ($eta/s$<0.3) we find that the isotropization time is approx. 0.8 fm/c and the thermalization time is approx. 1 fm/c. Moreover quark-gluon plasma production occurs in less than 1 fm/c, and almost perfect chemical equilibration takes place within 1 fm/c. Hence our work supports the common assumptions of hydrodynamics about thermalization, isotropization and equilibration of quark-gluon plasma.
Primary author
Mrs
Lucia Oliva
(INFN-Laboratori Nazionali del Sud, University of Catania)
Co-authors
Mr
Armando Puglisi
(Università degli Studi di Catania, Laboratori Nazionali del Sud)
Dr
Francesco Scardina
(University of Catania, INFN-Laboratori Nazionali del Sud)
Dr
Marco Ruggieri
(University of Catania)
Dr
Salvatore Plumari
(University of Catania, INFN-Laboratori Nazionali del Sud)
Prof.
Vincenzo Greco
(University of Catania, INFN-Laboratori Nazionali del Sud)
