2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/34182$ω(ϕ) \to \infty$ limit of scalar tensor theories are studied for traceless matter source. It is shown that the limit $ω(ϕ) \to \infty$ does not reduce a scalar tensor theory to general relativity. An exact radiation solution of scalar tensor cosmology under Nordtvedt conditions is obtained for flat Friedmann universe.9 pages, no figures, LatexGeneral Relativity and Quantum Cosmologytext