Formation and Hadronization of Quark Matter

Triggered by the expectation of forming a quark gluon plasma in ultrarelativistic collisions, there are, presently, considerable experimental effords to achieve this goal. On the other hand, there are, so far, no really realistic theoretical approaches to describe these collisions. In particular, microscopic dynamical models as the string model cannot account for the formation of a quark gluon plasma, the ultimate goal in this field. It is certainly not satisfactory to consider these dynamical models just as background, with the interesting physics going beyond.