2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/195578We consider a linearized, effective quantum theory of gravitation in which gravity weakens at energies higher than ~10^-3 eV in order to accommodate the apparent smallness of the cosmological constant. Such a theory predicts departures from the static Newtonian inverse-square force law on distances below ~0.05 mm. However, we show that such a modification also leads to changes in the long-range behavior of gravity and is inconsistent with observed gravitational lenses.4 pages, 1 figures. V3: matches published versionAstrophysicsGeneral Relativity and Quantum CosmologyHigh Energy Physics - Phenomenologytext