2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/36544We use various results concerning isometry groups of Riemannian and pseudo-Riemannian manifolds to prove that there are spaces on which differential structure can act as a source of gravitational force (Brans conjecture). The result is important for the analysis of the possible physical meaning of differential calculus. Possible astrophysical consequences are discussed.General Relativity and Quantum CosmologyAstrophysicsHigh Energy Physics - Theorytext