2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/34728We study a five-dimensional cosmological model, which suggests that the universe bagan as a discontinuity in a (Higgs-type) scalar field, or alternatively as a conventional four-dimensional phase transition.10 pages, 2 figures; typo corrected in equation (18); 1 reference added; version to appear in International Journal of Modern Physics AGeneral Relativity and Quantum Cosmologytext