2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/8557We consider a two-field model for inflation where the second order metric perturbations can be amplified by a parametric resonance during preheating. We demonstrate that there can arise a considerable enhancement of non-Gaussianity sourced by the local terms generated through the coupled perturbations. We argue that the non-Gaussianity parameter could be as large as f_{NL} ~ 50. Our results may provide a useful test of preheating in future CMB experiments.4 pages ReVTeX4, discussion and references added, conclusions unchangedAstrophysicsGeneral Relativity and Quantum CosmologyHigh Energy Physics - PhenomenologyHigh Energy Physics - Theorytext