2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/42847Brane models at low energy are described by an effective action involving gravity and two moduli fields associated with the brane positions. The scalar-tensor nature of the effective theory and the coupling to matter are explicitly spelt out. We discuss the post-Newtonian gravitational constraints on the models, some applications to quintessence and the variations of constants.5 pages, one figure; contribution to the proceedings of the Marseille conference "Where cosmology and fundamental physics meet"High Energy Physics - PhenomenologyAstrophysicsHigh Energy Physics - Theorytext