  New solutions of 3+1D covariant kinetic theory are presented for nuclear
collisions in the energy domain Ecm ~ 200 AGeV. They are obtained using MPC, a
new Monte-Carlo parton transport technique that employs very high parton
subdivision that is necessary to preserve covariance. The transport results are
compared with ideal hydrodynamics solutions. We show that the transport
evolution differs significantly from hydrodynamics. In addition, we compare the
transport freeze-out distributions to those obtained from ideal hydrodynamics
with the Cooper-Frye isotherm freeze-out prescription. The transport freeze-out
four-volume is shown to be sensitive to the reaction rates and deviates from
both time-like and space-like freeze-out 3D hypersurfaces commonly assumed. In
particular, we find that there does not exist a universal freeze-out
temperature. Finally, the transverse momentum distributions are found to
deviate by up to an order of magnitude from (Cooper-Frye frozen) hydrodynamics
for a wide range of possible initial conditions and reaction rates at RHIC
energies.
