A UV/IR COMPLETE BRANEWORLD INFLATION

Abstract

A UV/IR complete theory of cosmological inflation is constructed in a braneworld setup that the inflaton field evolves on a DGP brane and the curvature effect is incorporated via the Gauss–Bonnet term in the bulk action. While the Induced Gravity on the DGP brane is a manifestation of the IR limit, the stringy Gauss–Bonnet effect in the bulk action realizes the UV sector of the scenario. This scenario generally supports a red power spectrum of perturbations, and for a large field regime requires a smaller number of e-folds than other braneworld inflation scenarios given the same assumptions. For the tensor-to-scalar ratio, this inflation scenario gives a better fit to observation than alternative scenarios.