2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/180589In these notes we give an introduction to the concept of spaces with GxG-structure and their structured submanifolds. These objects generalise the classical notion of a calibrated submanifold. Therefore, they are interesting from a string theory viewpoint as they are relevant to describe D-branes in string compactifications on backgrounds with fluxes.4 pages; contribution to the proceedings of the RTN workshop "Constituents, Fundamental Forces and Symmetries of the Universe", Naples, Italy, 9-13 Oct 2006High Energy Physics - Theorytext