An Etymological Dictionary of Astronomy and Astrophysics

A → braneworld theory in which the → space-time is locally embedded in a five dimensional space, the → bulk, and has as a key aspect leakage of gravitational energy into the bulk.

More specifically, the → graviton is pinned to a four-dimensional braneworld by intrinsic curvature terms induced by quantum matter fluctuations. But as it propagates over large distances, the graviton eventually evaporates off the brane into an infinite volume, five-dimensional Minkowski bulk. Therefore, the DGP braneworld theory is a model in a class of theories in which gravity deviates from conventional → General Relativity not at short distances, but rather at long distances. This means that at those distances General Relativity cannot correctly describe gravitational interactions.

This model has various cosmologically interesting features. Particularly in the model with five dimensional bulk, the → accelerating expansion of the Universe at late epoch is realized without introducing the → cosmological constant (see, e.g., A. Lue, 2002, arxiv.0208169, T. Tanaka, 2003, arXiv.0305031).

See also: G. Dvali, G. Gabadadze and M. Porrati, 2000, Phys. Lett. 485B, 208.