2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/230699We derive new consistency conditions for string compactifications with generic fluxes (RR, NSNS, geometrical) and localized sources (D-branes, NS-branes, KK-monopoles). The constraints are all related by string dualities and share a common origin in M-theory. We also find new sources of instabilities. We discuss the importance of these conditions for the consistency of the effective action and for the study of interpolating solutions between vacua.29 pages, 2 figures, v2: published versionHigh Energy Physics - Theorytext