Cosmological quark-hadron phase transition and formation of isothermal density fluctuations

The dynamical process of the cosmological quark-hadron phase transition is investigated under the assumption of a weakly first-order phase transition. In particular the characteristic mass of these nuggets is determined to be smaller than 1019g, using a spatial correlation function of the trapped quark phase. Furthermore, the possibility of these nuggets being left as isothermal baryonic clouds with very high density (deltarhosub(b)/rhosub(b)proportional5.0x1012) after evaporation is pointed out, and its cosmological implications are discussed. (orig.)