2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/173711This contribution reviews recent work on a new approach to the cosmological constant problem, which starts from the macroscopic behavior of a conserved relativistic microscopic variable q. First, the statics of the vacuum energy density is discussed and, then, the dynamics in a cosmological context.Parallel talk at ICHEP08, Philadelphia, USA, July 2008. 6 pages, LaTeX, 2 eps figures. v4: minor polishingGeneral Relativity and Quantum CosmologyAstrophysicsHigh Energy Physics - PhenomenologyHigh Energy Physics - Theorytext