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Ultra-relativistic nucleus-nucleus collisions create a state of matter of high temperature and small baryo-chemical potential, which is similar to the thermodynamical conditions in the primordial universe. Recent analyses of Au+Au collisions at RHIC revealed the temperature, size and density of the system. Thus, a comparison to the primordial universe can be attempted. In particular, two observables shall be investigated, namely (1) the temperature at baryon freeze-out (about t=10 fm/c in the $Au$ + $Au$ collision) and (2) the matter density at the partonic stage (t>1 fm/c).

A COMPARISON BETWEEN AN ULTRA-RELATIVISTIC AU+AU COLLISION AND THE PRIMORDIAL UNIVERSE