On Resonant Leptogenesis

Details On Resonant Leptogenesis On Resonant Leptogenesis

2007-05-15

arxiv.org/abs/0705.2183v2

JCAP0708:013,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 7 figures. IOP LaTeX class used. Minor corrections and references added. Matches the version published in JCAP

Scientific paper

10.1088/1475-7516/2007/08/013

It has been recently shown that the quantum Boltzmann equations may be relevant for the leptogenesis scenario. In particular, they lead to a time-dependent CP asymmetry which depends upon the previous dynamics of the system. This memory effect in the CP asymmetry is particularly important in resonant leptogenesis where the asymmetry is generated by the decays of nearly mass-degenerate right-handed neutrinos. We study the impact of the nontrivial time evolution of the CP asymmetry in resonant leptogenesis, both in the one-flavour case and with flavour effects included. We show that significant qualitative and quantitative differences arise with respect to the case in which the time dependence of the CP asymmetry is neglected.

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