2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/35108I discuss possible implications a symmetry relating gravity with antigravity might have for smoothing out of the cosmological constant puzzle. For this purpose, a very simple model with spontaneous symmetry breaking is explored, that is based on Einstein-Hilbert gravity with two self-interacting scalar fields. The second (exotic) scalar particle with negative energy density, could be interpreted, alternatively, as an antigravitating particle with positive energy.3 pages, no figures, revtexGeneral Relativity and Quantum Cosmologytext