DISORIENTED CHIRAL CONDENSATES IN THE (2-DIMENSIONAL GROSS-NEVEU MODEL - A DYNAMICAL SIMULATION(1))

We study the dynamics of the formation of disoriented chiral condensat e (DCC) regions which follow the expansion of a high energy density re gion into the ''cold'' vacuum. We numerically solve the classical equa tions of motions for an effective Hamiltonian based on the one-loop ef fective potential for the massive 2+1-dimensional Gross-Neveu model. W e pay attention to the setting of the initial conditions and to determ ining which parameters are relevant for a strong amplification of the pion field. We find that the size of the ''hot'' source plays a signif icant role. For large enough source radii, we observe strong correlati on phenomena, corresponding to the growth of large regions where the p ion field oscillates along a given direction. We give our results in t erms of the theta angle which defines the DCC disorientation, of the l ocal ratios R(a) = pi(a)(2)/pi(2) (a = 1,2,3), and of the energies ass ociated with the fields at representative times.