2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/200715The value of scalar field coupled to gravity should be less than the Planck scale in the consistent theory of quantum gravity. It provides a theoretic constraint on the equation of state parameter for the quintessence. In some cases our theoretic constraints are more stringent than the constraints from the present experiments.4 pages, 2 figures; minor corrections and refs addedAstrophysicsHigh Energy Physics - PhenomenologyHigh Energy Physics - Theorytext