2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/36067We consider whether local and causal non-conservation of energy may occur in generally covariant theories with long-ranged fields (analogs of Newton's gravity) whose source is energy--momentum. We find that such a possibility exists in (1+1) dimensions.9 pages, 2 figures. To appear in Proc. XX Int. Workshop on Fundamental Problems of High Energy Physics and Field Theory, Protvino, June 1997General Relativity and Quantum Cosmologytext