DGP model

In theoretical physics, DGP gravity is a model proposed by Dvali, Gabadadze, and Porrati in 2000 that assumes that a 3-dimensional brane is embedded in a five-dimensional spacetime and addition Einstein-Hilbert term is concentrated near the brane. This assumption makes gravity four-dimensional at short distances and five-dimensional at long distances. The model is popular with the model builders but has resisted embedding into string theory.