论文标题
不稳定的中微子可以放松宇宙学质量界限
Unstable Neutrinos can Relax Cosmological Mass Bounds
论文作者
论文摘要
目前，通过宇宙学探针最严格地限制了光中微子的肿块。特别是Planck合作报告$ \ summ_ν\ leq 0.12 \，\ mathrm {ev} $ at $ 95 \％$ cl在标准宇宙学模型中。这比实验室搜索产生的一数以上要强一个数量级。面值所采用的宇宙学结合不包括许多中微子风味模型，这些模型可以成功解释中微子振荡数据。但是，宇宙学结合的间接性质允许放宽绑定到最多$ \ summ_ν\ sim 1 \，\ mathrm {ev} $，如果neutrinos decay在时间刻度上的衰减比宇宙的年龄短，$τ_ν\ leq t_u $。我们介绍如何在最小扩展Seesaw框架的一般模型中实现$ν_i\ to nv to n时间的类型的衰减。然后，在$ u（1）_ {μ-τ} $风味模型的上下文中明确实现了这个想法。
The light neutrino masses are at present most stringently constraint via cosmological probes. In particular the Planck collaboration reports $ \sum m_ν\leq 0.12\,\mathrm{eV}$ at $95\%$ CL within the standard cosmological model. This is more than one order of magnitude stronger than the one arising from laboratory searches. The cosmological bound taken at face value excludes a plethora of neutrino flavour models which can successfully explain the neutrino oscillation data. The indirect nature of the cosmological bound, however, allows to relax the bound to up to $ \sum m_ν\sim 1\,\mathrm{eV}$ if neutrinos decay on timescales shorter than the age of the Universe, $τ_ν\leq t_U$. We present how a decay of the type $ν_i\toν_4ϕ$ can be realized within general models of the minimal extended seesaw framework. The idea is then explicitly realized within the context of a $U(1)_{μ-τ}$ flavour model.
