2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/200069In this talk I review three fatal flaws of the DGP braneworld model, which has been put forward as a possible model for late time acceleration without a cosmological constant: Ghosts, Cosmological Crashes, and Instability of the 5D vacuum. The talk is based on work in collaboration with Charmousis, Kaloper, Myers and Padilla.Write up of a talk given at the 8th Asia-Pacific International Conference on Gravitation and Astrophysics. 10 pages PTPTex style, 3 figuresHigh Energy Physics - Theorytext