2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/107305We derive four-dimensional effective theories for warped compactification of the ten-dimensional IIB supergravity. We show that these effective theories allow a much wider class of solutions than the original higher-dimensional theories. This result indicates that the effective four-dimensional theories should be used with caution, if one regards the higher-dimensional theories more fundamental.4 pages, no figure. Contribution to proceedings of the workshop "The 15th Workshop on General Relativity and Gravitation" (Japan, November 2005)High Energy Physics - Theorytext