On the Brane Cosmology of KK Gravitinos
Abstract
Description
In this report I consider the cosmology of KK gravitinos in models with extra dimensions, in particular in connection with the known non--standard high energy regime of expansion which is associated with them. The main result is that the production of such KK modes, once one considers BBN constraints on the allowed entropy released in their decays, is not compatible with non--standard expansion after inflation: there is no five--dimensional Planck mass for which the produced KK gravitinos are safe with respect to BBN. This conclusion holds for both flat and warped models in which only gravity propagates in the full spacetime. This report is based on the work arXiv:0705.4227 [hep-ph].
To appear in the Proceedings of the XXXVI ITEP Winter School 2008, Session ``Particle Physics'', held in Otradnoe, Moscow Region, Russia, February 8--16, 2008
To appear in the Proceedings of the XXXVI ITEP Winter School 2008, Session ``Particle Physics'', held in Otradnoe, Moscow Region, Russia, February 8--16, 2008