2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/203514We present a gauge invariant argument that a nonlocal measure of second-order metric and matter perturbations dominate that of linear fluctuations in its effect on the gravitational field in 'slow-rolling' spacetimes.Version accepted by PRL (however, with correct non PRL format for arxiv posting). Clarified and expandedGeneral Relativity and Quantum Cosmologytext