2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/113681I give a pedagogical introduction to the concepts and the tools that are necessary to study particle physics models in higher dimensions. I then give a more detailed presentation of warped compactifications and discuss their possible relevance to the hierarchy problem.56 pages, 11 figures, lectures given at Cargese School "Particle Physics and Cosmology: the Interface'', August 2003High Energy Physics - Phenomenologytext