APPROACH TO SCALING IN PHASE-ORDERING KINETICS

The influence of the initial fluctuations on the onset of scaling in t he quench to zero temperature of a two dimensional system with conserv ed order parameter is analyzed in detail with and without topological defects. We find that the initial fluctuations greatly affect the way scaling is reached, while the number of components of the order parame ter does not play a significant role. Under strong initial fluctuation s the preasymptotic linear behavior is replaced by the mean field beha vior of the large-N model, producing the multiscaling to standard-scal ing crossover also in the physically interesting cases of systems with a small number of components.