2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/195274We propose an economical model of nonthermal leptogenesis following inflation during ``instant'' preheating. The model involves only the inflaton field, the standard model Higgs, and the heavy ``right-handed'' neutrino.9 pages, 3 figures, to be published in PRDAstrophysicsHigh Energy Physics - Phenomenologytext