Abstract
We suggest the possibility that in Arkani-Hamed--Dimopoulos--Dvali (ADD)-type brane-world scenarios the higher Kaluza-Klein (KK) excitations of the graviton may decay to lower ones owing to a breakdown of the conservation of extra dimensional ``momenta'' and study its implications for astrophysics and cosmology. We give an explicit realization of this idea with a bulk scalar field $\ensuremath{\Phi},$ whose nonzero KK modes acquire vacuum expectation values. This scenario helps to avoid constraints on large extra dimensions that come from gamma ray flux bounds in the direction of nearby supernovae as well as those coming from a diffuse cosmological gamma ray background. It also relaxes the very stringent limits on the reheat temperature of the Universe in ADD models.
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