Inflation on the Brane with Vanishing Gravity
Abstract
Many existing models of brane inflation suffer from a steep irreducible gravitational potential between the branes that causes inflation to end too early. Inspired by the fact that point masses in 2+1 D exert no gravitational force, we propose a novel unwarped and non-supersymmetric setup for inflation, consisting of 3-branes in two extra dimensions compactified on a sphere. The size of the sphere is stabilized by a combination of a bulk cosmological constant and a magnetic flux. Computing the 4D effective potential between probe branes in this background, we find a non-zero contribution only from exchange of level-1 KK modes of the graviton and radion. Identifying antipodal points on the 2-sphere projects out these modes, eliminating entirely the troublesome gravitational contribution to the inflationary potential.
Keywords
Cite
@article{arxiv.0911.5343,
title = {Inflation on the Brane with Vanishing Gravity},
author = {Jason Gallicchio and Rakhi Mahbubani},
journal= {arXiv preprint arXiv:0911.5343},
year = {2010}
}
Comments
19 pages, 11 figures, JHEP format