Finite Memory in the Collision Processes of a Fermionic System and its Effect on Relativistic Heavy Ion Collisions

We consider equilibration in relativistic nuclear dynamics starting from a nonequilibrium Greensfunctions approach. The widely used Boltzmann-Uehling-Uhlenbeck equation is obtained only as the Markovian limit (i.e. negligible memory time). The actual memory time in energetic nuclear collisions turns out to be ~ 2−3 \(\frac{fm}{c}\), which interferes substantially with the time-scale of the relaxation process. The memory kernels of the two-particle collisions and their feedback on the complete dynamics (by an explicite comparison with the standard Boltzmann treatment) will be presented.