2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/198910We compute the leading-order back-reaction to dilaton-driven inflation, due to graviton, dilaton and gauge-boson production. The one-loop effect turns out to be non-vanishing (unlike the case for pure de-Sitter and for power-law inflation), to be of relative order $\ell_P^2H^2(t)$, and to have the correct sign for favouring the exit to a FRW phase.27 pages, Latex, 7 figuresHigh Energy Physics - TheoryAstrophysicsGeneral Relativity and Quantum Cosmologytext