Dark energy from the fifth dimension

After extending the Regge-Teitelboim formulation of gravity to include case where background embedding space is not flat, we examine dynamics four-dimensional $k=0$ Robertson-Walker (RW) manifold embedded in various five-dimensional backgrounds. We find that when de Sitter space, RW undergoes a transition from de-accelerating phase an accelerating phase. This occurs before inclusion matter, radiation or cosmological constant sources, and thus does require balance different components. obtain reasonable two-parameter fit this model Hubble parameter data.