Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-08-05
Phys.Rev.D68:116001,2003
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, latex
Scientific paper
10.1103/PhysRevD.68.116001
We suggest the possibility that in ADD type brane-world scenarios, the higher 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 $\Phi$, 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 diffuse cosmological gamma ray background. It also relaxes the very stringent limits on reheat temperature of the universe in ADD models.
Mohapatra Rabindra N.
Nussinov Shmuel
Pérez--Lorenzana Abdel
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