Chiral fluid dynamics and collapse of vacuum bubbles

We study the expansion dynamics of a quark-antiquark plasma droplet from an initial state with restored chiral symmetry. The calculations are made wit hin the linear a model scaled with an additional scalar field representing the gluon condensate. We solve numerically the classical equations of motio n for the meson fields coupled to the fluid-dynamical equations for the pla sma. Strong spacetime oscillations of the meson fields are observed in the course of the chiral transition. A new phenomenon, the formation and collap se of vacuum bubbles, is predicted, The particle production due to the brem sstrahlung of the meson fields is estimated.