DISORIENTED CHIRAL CONDENSATE FORMATION FROM A STATE WITH COLLECTIVE PION FIELDS

At high temperatures it is believed that one can create a highly excit ed state, the starting point of disoriented chiral condensate (DCC) fo rmation, which is sitting at the top of a potential barrier. We study here instead the evolution of a state where energy is stored initially in the collective motion too, in particular, in chiral rotations repr esenting collective pion fields. We simulate the creation of such an i nitial state by letting the hot system evolve in time without cooling. It covers the microcanonically allowed phase space if the classical d ynamics of the system is chaotic. We find the collective field dynamic s chaotic in the linear a model coupled to quarks with explicit symmet ry breaking. A rapid linear expansion from such initial states leads e ventually to DCC formation.