Brane Cosmology and KK Gravitinos

Details Brane Cosmology and KK Gravitinos Brane Cosmology and KK Gravitinos

2007-05-29

arxiv.org/abs/0705.4227v2

JCAP0709:018,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, references added, IoP style

Scientific paper

10.1088/1475-7516/2007/09/018

The cosmology of KK gravitinos in models with extra dimensions is considered. The main result is that the production of such KK modes is not compatible with an epoch of non--standard expansion after inflation. This is so because the BBN constraint on the zero mode forces the reduced five dimensional Planck mass $M_5$ down to values much smaller than the usual four dimensional one, but this in turn implies many KK states available for a given temperature. Once these states are taken into account one finds that there is no $M_5$ for which the produced KK gravitinos satisfy BBN and overclosure constraints. This conclusion holds for both flat and warped models in which only gravity propagates in the full spacetime.

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