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The infrared behaviour of the medium modified gluon propagator innon-equilibrium situations is studied in the covariant gauge using theSchwinger-Keldysh closed-time path formalism. It is shown that the magneticscreening mass is non-zero at the one loop level whenever the initial gluondistribution function is non isotropic with the assumption that thedistribution function of the gluon is not divergent at zero transversemomentum. For isotropic gluon distribution functions, such as those describinglocal equilibrium, the magnetic mass at one loop level is zero which isconsistent with finite temperature field theory results. Assuming that areasonable initial gluon distribution function can be obtained from aperturbative QCD calculation of minijets, we determine these out of equilibriumvalues for the initial magnetic and Debye screening masses at energy densitiesappropriate to RHIC and LHC. We also compare the magnetic masses obtained herewith those obtained using finite temperature lattice QCD methods at similartemperatures at RHIC and LHC.Comment: 21 pages latex, 4 figures, final version to be published in Phys.  Rev.

Infrared behavior of the gluon propagator in nonequilibrium situations