2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/213293In this paper we investigate the dynamics of solitons occurring in the nonlinear Schroedinger equation when a parameter h->0. We prove that under suitable assumptions, the the soliton approximately follows the dynamics of a point particle, namely, the motion of its barycenter $q_h(t)$ satisfies the equation $ddot{q}_h(t)+\nabla V(q_h(t))=H_h(t)$ where $\sup_{t\in R} |H_h(t)| -> 0$ as h->0.Mathematical PhysicsAnalysis of PDEs35Q55, 35Q51, 37K40, 37K45, 47J35text