2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/154284We study the time evolution of fidelity in a dynamical many body system, namely a kicked Ising model, modified to allow for a time reversal invariance breaking. We find good agreement with the random matrix predictions in the realm of strong perturbations. In particular for the time-reversal symmetry breaking case the predicted revival at Heisenberg time is clearly seen.6 pages, 6 figuresQuantum Physicstext