Big bang nucleosynthesis constraints on bulk neutrinos

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  • 13 October 2001
Abstract
We examine the constraints imposed by the requirement of successful nucleosynthesis on models with one large extra hidden space dimension and a single bulk neutrino residing in this dimension. We first use naive out of equilibrium conditions to constrain the size of the extra dimensions and the mixing between the active and the bulk neutrino. We then use the solution of the Boltzman kinetic equation for the thermal distribution of the Kaluza-Klein modes and evaluate their contribution to the energy density at the BBN epoch to constrain the same parameters.

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