2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/35072The inclusion of a $Λ$ term, today, in the relativistic field equations is consequence of the evolution of an observational cosmology. In this work we argue the "ansatz" $Λ= βH^2 +\fracα{R^2}$ is applicable to the total energy density of the universe, discuss some cosmological consequences and compare the growing mode of the density contrast with the corresponding mode of the standard model.10 pages, 5figures. XXV National Meeting of Particles and Fields PhysicsGeneral Relativity and Quantum Cosmologytext