2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/225647We present a cosmological model for early stages of the universe on the basis of a Weyl-Cartan spacetime. In this model, torsion $T^α$ and nonmetricity $Q_{αβ}$ are proportional to the vacuum polarization. Extending earlier work of one of us (RT), we discuss the behavior of the cosmic scale factor and the Weyl 1-form in detail. We show how our model fits into the more general framework of metric-affine gravity (MAG).19 pages, 5 figures, typos corrected, uses IOP style fileGeneral Relativity and Quantum Cosmologytext