2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/134946Using standard big-bang nucleosynthesis and present, high-precision measurements of light element abundances, we place constraints on the self-gravity of radiation pressure in the early universe. The self-gravity of pressure is strictly non-Newtonian, and thus the constraints we set are a direct test of this aspect of general relativity.4 pages, 1 figureAstrophysicstext