Viability of Dirac phase leptogenesis
Viability of Dirac phase leptogenesis
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DOI：
10.1088/1475-7516/2008/04/033
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发表时间：
2007-07
影响因子：
6.4
通讯作者：
A. Anisimov;Steve Blanchet;P. Di Bari
中科院分区：
文献类型：
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作者：
A. Anisimov;Steve Blanchet;P. Di Bari
我们讨论了不消失的狄拉克相δ和混合角θ13的条件，它们是中微子振荡中CP违逆的来源，是通过轻生作用观察到的宇宙物质-反物质不对称的唯一原因。我们证明，当考虑重右手中微子谱的简并极限时，这种我们称之为δ-轻生的情况是可行的。我们在sinθ13和绝对中微子质量尺度上推导了一个有趣的联合条件，可以在未来的中微子振荡实验中进行检验。在分层重RH中微子谱的限制下，我们加强了先前的结果，即δ-轻生现象只被非常有限地允许，即使考虑到两个较重的RH中微子的产生。改进sinθ13的实验上界和/或量子动力学效应的解释可以在将来完全排除这种可能性。因此，δ- lepptogenesis也可以看作是简并重中微子谱模型的动机。
We discuss the conditions for a non-vanishing Dirac phase δ and mixing angle θ13, sources of CP violation in neutrino oscillations, to be uniquely responsible for the observed matter–antimatter asymmetry of the Universe through leptogenesis. We show that this scenario, that we call δ-leptogenesis, is viable when the degenerate limit for the heavy right-handed (RH) neutrino spectrum is considered. We derive an interesting joint condition on sinθ13 and the absolute neutrino mass scale that can be tested in future neutrino oscillation experiments. In the limit of the hierarchical heavy RH neutrino spectrum, we strengthen the previous result that δ-leptogenesis is only very marginally allowed, even when the production from the two heavier RH neutrinos is taken into account. An improved experimental upper bound on sinθ13 and/or an account of quantum kinetic effects could completely rule out this option in the future. Therefore, δ-leptogenesis can be also regarded as motivation for models with degenerate heavy neutrino spectrum.