2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/156937We derive a formula predicting dynamical tunneling rates from regular states to the chaotic sea in systems with a mixed phase space. Our approach is based on the introduction of a fictitious integrable system that resembles the regular dynamics within the island. For the standard map and other kicked systems we find agreement with numerical results for all regular states in a regime where resonance-assisted tunneling is not relevant.4 pages, 4 figuresChaotic DynamicsQuantum Physicstext