Asymptotic solutions of a nonlinear diffusive equation in the framework of k-generalized statistical mechanics

The asymptotic behavior of a nonlinear diffusive equation obtained in the framework of the ?-generalized statistical mechanics is studied. The analysis based on the classical Lie symmetry shows that the ?-Gaussian function is not a scale invariant solution of the generalized diffusive equation. Notwithstanding, several numerical simulations, with different initial conditions, show that the solutions asymptotically approach to the ?-Gaussian function. Simple argument based on a time-dependent transformation performed on the related ?-generalized Fokker-Planck equation, supports this conclusion.