2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/57931We have shown that a scalar field can be used, employing Scherrer's k essence cosmological sound calculation, to model how we evolve from a dark matter- dark energy mix to a cosmological constant. Here, we are exploring what initiates the decay of the near perfect thin wall approximation on that scalar field to circumstances permitting a k essence speed-of-sound argument in favor of traditional models of Einstein's cosmological constant as a driving force for inflationary expansion.7 pages, no figures: Minor spelling errors (two) fixed abstract & textMathematical Physics85A40text