Brane inflation
Abstract
We present a novel inflationary scenario in theories with low scale (TeV) quantum gravity, in which the standard model particles are localized on the branes whereas gravity propagates in the bulk of large extra dimensions. This inflationary scenario is natural in the brane world picture. In the lowest energy state, a number of branes sit on top of each other (or at an orientifold plane), so the vacuum energy cancels out. In the cosmological setting, some of the branes ``start out'' relatively displaced in the extra dimensions and the resulting vacuum energy triggers the exponential growth of the 3 noncompact dimensions. The number of efoldings can be very large due to the very weak branebrane interaction at large distances. In the effective fourdimensional field theory, the brane motion is described by a slowly rolling scalar field with an extremely flat plateau potential. When branes approach each other to a critical distance, the potential becomes steep and inflation ends rapidly. Then the branes ``collide'' and oscillate about the equilibrium point, releasing energy mostly into radiation on the branes. In this scenario, it is even possible for the electroweak Higgs field to be the inflaton.
 Publication:

Physics Letters B
 Pub Date:
 March 1999
 DOI:
 10.1016/S03702693(99)00132X
 arXiv:
 arXiv:hepph/9812483
 Bibcode:
 1999PhLB..450...72D
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 15 pages, Latex