2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/186388An explicitly covariant formulation is presented of a modified DGP scenario proposed recently [1], to avoid the instability of the self-accelerating branch. It is based on the introduction of a bulk scalar field with appropriate non-minimal coupling to the bulk Einstein-Hilbert term. The method is general and may be applied to other models as well.10 pages, no figures; v2: version published in JHEPHigh Energy Physics - TheoryAstrophysicsHigh Energy Physics - Phenomenologytext