2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/150606In molecular simulations, one of the most difficult points is to track the real dynamics of many-body systems from the first principle. The present study shows that step-size dependences have an unexpected effect on simulation results, even when we use the standard high-precision numerical integrators to apply to a simple system with a two-body interaction. The validity of our analysis is checked by the theory of adiabatic approximations.8pages, LaTeXChaotic Dynamicstext