2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/148228I discuss the quantum instability of an electric field in a theory of open strings.3p. LATEX , Talk at Rome Workshop on Quantum Gravity, String Theory and Grand Unification, Ecole Polytechnique preprint A232.0393 (Previous submission corrupted by mailer)High Energy Physics - Theorytext