2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/177346We study a stochastic formalism for a nonperturbative treatment of the inflaton field in the framework of a noncompact Kaluza-Klein (KK) theory during an inflationary (de Sitter) expansion, without the slow-roll approximation.version to be published in Phys. Lett. BGeneral Relativity and Quantum CosmologyAstrophysicsHigh Energy Physics - PhenomenologyHigh Energy Physics - TheoryNoncompact KK theory of gravity: stochastic treatment for a nonperturbative inflaton field in a de Sitter expansiontext