2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/189551The scales associated with Brown-Teitelboim-Bousso-Polchinski processes of brane nucleation, which result in changes of the flux parameters and the number of D-branes, are discussed in the context of type IIB models with all moduli stabilized. It is argued that such processes are unlikely to be described by effective field theory.some corrections made, conclusions unchanged, references added, 10 pagesHigh Energy Physics - Theorytext