Relaxation processes in relativistic plasma created from vacuum by a strong field

We consider a relaxation process in a relativistic plasma of particles and antiparticles created from vacuum by a supercritical classical Abelian field. Quark-gluon plasma evolution is described by the kinetic equation with a source term and collisional integral in the Belyaev-Budker form with perturbative cross sections for parton scatterings. The back reaction of created partons on the generating field is taken into account. Being solved numerically, the set of equations does not result in a fast attainment of a quasi-equilibrium state for systems under discussion. To get a reasonable estimate for the relaxation time of quark-gluon plasma, one needs to increase the cross sections several times that would effectively correspond to accounting for radiative perturbative processes and scatterings of nonperturbative partons, as well. (author)