Aspects of thermal leptogenesis in braneworld cosmology

Details Aspects of thermal leptogenesis in braneworld cosmology Aspects of thermal leptogenesis in braneworld cosmology

2005-08-19

arxiv.org/abs/hep-ph/0508213v2

Phys.Rev. D73 (2006) 023506

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 3 figures, a few comments and references added. Final version to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.73.023506

The mechanism of thermal leptogenesis is investigated in the high-energy regime of braneworld cosmology. Within the simplest seesaw framework with hierarchical heavy Majorana neutrinos, we study the implications of the modified Friedmann equation on the realization of this mechanism. In contrast with the usual leptogenesis scenario of standard cosmology, where low-energy neutrino data favors a mildly strong washout regime, we find that leptogenesis in the braneworld regime is successfully realized in a weak washout regime. Furthermore, a quasi-degenerate light neutrino mass spectrum is found to be compatible with this scenario. For an initially vanishing heavy Majorana neutrino abundance, thermal leptogenesis in the brane requires the decaying heavy Majorana neutrino mass to be M1 > 10^10 GeV and the fundamental five-dimensional gravity scale 10^12 < M5 < 10^16 GeV, which corresponds to a transition from brane to standard cosmology at temperatures 10^8 < Tt < 10^14 GeV.

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