2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/34143The causality principle imposes the constraints on the cosmological parameters in the relativistic theory of gravitation. As a result, X-matter causes the quite definite cosmological scenario with the alternate acceleration and deceleration and the final recollapse6 pages, 2 figures, LaTeX2e, commented Maple 6 worksheet is accessible on http://www.geocities.com/optomaplevGeneral Relativity and Quantum Cosmologytext