Determining the neutrino lifetime from cosmology
Determining the neutrino lifetime from cosmology
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DOI：
10.1103/physrevd.103.043519
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发表时间：
2020-02
期刊：
影响因子：
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通讯作者：
Z. Chacko;Abhish Dev;P. Du;V. Poulin;Yuhsin Tsai
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文献类型：
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作者：
Z. Chacko;Abhish Dev;P. Du;V. Poulin;Yuhsin Tsai
我们探索了中微子在变成非相对论性后衰变为不可见的暗辐射的理论的宇宙学信号。我们表明，在这种情况下，不久的将来，欧几里得卫星的大尺度结构测量，当与普朗克的宇宙微波背景数据相结合时，可能允许独立确定中微子的寿命和它们的质量总和。这些参数可以独立确定，因为欧几里得数据将涵盖一系列红移，从而可以跟踪结构随时间的增长。如果中微子在宇宙时间尺度上是稳定的，这些观测可以将中微子寿命的下限提高7个数量级，从0（10）年提高到2×10^8年（95% C.L.），而不会显著影响中微子质量的测量。另一方面，如果中微子在变成非相对论性后衰变，但时间尺度小于0(1)亿年，这些观测可能不仅允许第一次测量中微子质量的总和，而且还可以从宇宙学中确定中微子的寿命。
We explore the cosmological signals of theories in which the neutrinos decay into invisible dark radiation after becoming non-relativistic. We show that in this scenario, near-future large scale structure measurements from the Euclid satellite, when combined with cosmic microwave background data from Planck, may allow an independent determination of both the lifetime of the neutrinos and the sum of their masses. These parameters can be independently determined because the Euclid data will cover a range of redshifts, allowing the growth of structure over time to be tracked. If neutrinos are stable on cosmological timescales, these observations can improve the lower limit on the neutrino lifetime by seven orders of magnitude, from O(10) years to 2×10^8 years (95% C.L.), without significantly affecting the measurement of neutrino mass. On the other hand, if neutrinos decay after becoming non-relativistic but on timescales less than O(100) million years, these observations may allow, not just the first measurement of the sum of neutrino masses, but also the determination of the neutrino lifetime from cosmology.