论文标题
与宇宙学一致的大型中微子质量的Seesaw模型
A seesaw model for large neutrino masses in concordance with cosmology
论文作者
论文摘要
如果与标准方案相比，如果有效中微子的数量降低，则可以放松中微子质量的宇宙学约束，同时通过引入黑暗辐射的新组件来保持有效的中微子物种$ n _ {\ rm eff} \ 3 $。我们讨论了一个紫外线完整的模型，以实现这一想法，该模型同时通过Seesaw机制提供中微子质量。它基于黑暗扇区中的$ u（1）$对称性，该对称可以是衡量的或全球的。除了沉重的Seesaw Neutminos外，我们还需要引入$ \ Mathcal {O}（10）$世代的无菌中微子提供深色辐射。然后，在Katrin实验的灵敏度范围内，我们可以使用$ \ summ_ν\ sim 1 $ eV容纳活跃的中微子质量。我们讨论模型的现象学并确定允许的参数空间。我们认为该模型的测量版本是首选的，在这种情况下，该模型的典型能量尺度在10 MEV至少数GEV范围内。
Cosmological constraints on the sum of the neutrino masses can be relaxed if the number density of active neutrinos is reduced compared to the standard scenario, while at the same time keeping the effective number of neutrino species $N_{\rm eff}\approx 3$ by introducing a new component of dark radiation. We discuss a UV complete model to realise this idea, which simultaneously provides neutrino masses via the seesaw mechanism. It is based on a $U(1)$ symmetry in the dark sector, which can be either gauged or global. In addition to heavy seesaw neutrinos, we need to introduce $\mathcal{O}(10)$ generations of massless sterile neutrinos providing the dark radiation. Then we can accommodate active neutrino masses with $\sum m_ν\sim 1$ eV, in the sensitivity range of the KATRIN experiment. We discuss the phenomenology of the model and identify the allowed parameter space. We argue that the gauged version of the model is preferred, and in this case the typical energy scale of the model is in the 10 MeV to few GeV range.
