Theory and phenomenology of DGP gravity

摘要

I review some aspects of the Dvali-Gabadadze-Porrati (also known as "brane-induced") model of gravity. This model provides a novel way to modify gravity at large distances and, as such, has potentially some interesting cosmological consequences, like the possibility of getting an accelerated expansion with a vanishing cosmological constant. In DGP gravity, the recovery of usual gravitational interaction at small (i.e. noncosmological) distances is rather nontrivial. This can lead to observable signature in observations made in the solar system. I discuss various aspects of the phenomenology of the model and briefly comment on the consistency of the whole approach.