2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/178026A simple derivation of the low-energy effective action for brane worlds is given, highlighting the role of conformal invariance. We show how to improve the effective action for a positive- and negative-tension brane pair using the AdS/CFT correspondence.5 pages, published versionHigh Energy Physics - Theorytext