2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/47569We examine Jordan-Brans-Dicke theories with a linear potential for the scalar field by means of a stochastic approach. The backreaction of the scalar field fluctuations on the classical background is described. The analysis is concentrated on those values of the Jordan-Brans-Dicke parameter which predict a superinflationary pre-big-bang branch. The graceful exit problem present in these theories is discussed.3 pages, Latex, sprocl.sty included, Proceedings of Cosmo'97, Charlotte Mason College, Ambleside, Lancashire, England, 15-19 Sept. 1997High Energy Physics - Phenomenologytext