  Multiple interactions of quarks and gluons in high-energy heavy-ion
collisions may give rise to interesting phemomena of color charges propagating
in high-density QCD matter. We study the dynamics of multi-parton systems
produced in nucleus-nucleus collisions at energies corresponding the the CERN
SPS and the future BNL RHIC experiments. Due to the complexity of the
multi-particle dynamics we choose to employ the parton cascade model in order
to simulate the development of multiple parton scatterings and associated
stimulated emision processes. Our results indicate a non-linear increase with
nuclear mass A of, e.g., parton multiplicity, energy density, strangeness, and
contrast a linear A-scaling as in Glauber-type approaches. If multiple
interactions are suppressed and only single parton scatterings (no
re-interactions) are considered, we recover such a linear behavior. It remains
to be studied whether these results on the parton level can be experimentally
seen in final-state observables, such as the charged particle multiplicity, the
magnitude of produced transverse energy, or the number of produced strange
hadrons.
