COMMENT ON THE PRESENCE OF CHAOS IN MEAN-FIELD DYNAMICS INSIDE THE SPINODAL REGION

In this letter we re-analyze the role of chaos in the mean field simul ations of spinodal decomposition, We demonstrate that, conversely to r ecent publications, the RPA unstable modes are only weakly non-linear and weakly coupled during the early clusterization of the system. The Lyapunov exponents are shown to be nothing but the largest imaginary R PA frequencies and the early mean field evolution, even of a randomly initialized trajectory, is shown to be mostly understandable within th e framework of linear instabilities. Finally we recall how the time sc ales are related to the use of a reasonable range for the nuclear forc e.