The (ir)Relevance of Initial Conditions in Soft Leptogenesis

Details The (ir)Relevance of Initial Conditions in Soft Leptogenesis The (ir)Relevance of Initial Conditions in Soft Leptogenesis

2007-10-21

arxiv.org/abs/0710.3905v3

JHEP 0811:046,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

v1: 12 pages; v2: typos corrected; v3: published version with new discussions and references

Scientific paper

10.1088/1126-6708/2008/11/046

We explore how the initial conditions affect the final lepton asymmetry in Soft Leptogenesis. It has been usually assumed that the initial state is a statistical mixture of sterile sneutrinos and anti-sneutrinos with equal abundances. We calculate the lepton asymmetry due to the most general initial mixture. The usually assumed equal mixture produces a small, but sufficient, lepton asymmetry which is proportional to the ratio of the supersymmetry breaking scale over the Majorana scale. A more generic mixture, still with equal contents of sneutrinos and anti sneutrinos, yields an unsuppressed lepton asymmetry. Mixtures of non equal contents of sneutrinos and anti sneutrinos result in a large lepton asymmetry too. While these results establish the robustness of Soft Leptogenesis and other mixing based mechanisms, they also expose their lack of predictive power.

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