Disoriented Chiral Condensates: A Dynamical Simulation In The (2+1)-Dimensional Gross-Neveu Model

We simulate the formation and growth of disoriented chiral condensate (DCC) regions which follow the expansion of a high energy density region into the "cold" vacuum. The numerical study is based on the one-loop effective potential for the massive 2+1-dimensional Gross-Neveu model. We pay attention to the setting of the initial conditions and to determining which parameters are relevant for a strong amplification of the pion field. We find that the size of the "hot" source plays a significant role. For large enough source radii, we observe strong correlation phenomena, corresponding to the growth of large regions where the pion field oscillates along a given direction. We give our results in terms of the ` angle which defines the DCC disorientation, of the other O(4) angles distributions, of the local ratios R a = ß 2 a =~ß 2 (a = 1; 2; 3), and of the energies associated with the fields at representative times