2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49112A new idea of the cosmological constant is proposed in this paper. Due to the horizon is limited, the quantum fluctuation of the inflaton field is not zero, a nonzero vacuum energy is remained as a residual inflationary energy of an unusual potential, however the true stable vacuum energy is zero fortunately. A unified model of the cosmological constant and the chaotic inflation is proposed, which satisfies almost all cosmological phenomenology and will can be tested by data of the cosmic large scale structure.7 pages, no figures, LatexHigh Energy Physics - PhenomenologyAstrophysicsGeneral Relativity and Quantum Cosmologytext