2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/35798Recent developments in theories of non-Riemannian gravitational interactions are outlined. The question of the motion of a fluid in the presence of torsion and metric gradient fields is approached in terms of the divergence of the Einstein tensor associated with a general connection. In the absence of matter the variational equations associated with a broad class of actions involving non-Riemannian fields give rise to an Einstein-Proca system associated with the standard Levi-Civita connection.13 pages LaTex (No Figures), Presented at the Stefan-Banach Conference on Mathematical Physics, Warsaw, Poland (1996)General Relativity and Quantum Cosmologytext