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Abstract: We consider leptogenesis in scenarios with many neutrino singlets. We findthat the lower bound for the reheating temperature can be significantly relaxedwith respect to the hierarchical three neutrino case. We further argue that theupper bound for the neutrino mass scale from leptogenesis gets significantlylifted in these scenarios. As a specific realization, we then discuss anextra-dimensional model, where the large number of neutrinos is provided byKaluza-Klein excitations.



Autor: Marc-Thomas Eisele

Fuente: https://arxiv.org/







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