Searching for the Radiative Decay of the Cosmic Neutrino Background with Line-Intensity Mapping
Searching for the Radiative Decay of the Cosmic Neutrino Background with Line-Intensity Mapping
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DOI：
10.1103/physrevlett.127.131102
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发表时间：
2021-09-22
影响因子：
8.6
通讯作者：
Kamionkowski, Marc
中科院分区：
文献类型：
--
作者：
Bernal, Jose Luis;Caputo, Andrea;Kamionkowski, Marc
本文研究了在宇宙中微子背景中利用线强度映射（LIM）从中微子辐射衰变中寻找光子的可能性。标准模型对这些衰变率的预测是非常小的，但如果新的物理学增加中微子电磁矩，它可以得到增强。衰变光子将作为天体物理谱线的闯入者出现。我们提出中微子衰变线可以用LIM聚类中的各向异性和体素强度分布来识别。正在进行的和未来的LIM实验将具有--取决于中微子层次、跃迁和所考虑的实验--对类似于10（-12）- 10（-8）（m（i）c（2）/0.1 eV）（3/2）mu（B）的有效电磁跃迁矩的灵敏度，其中m（i）是衰变中微子的质量，mu（B）是玻尔磁子。这将比宇宙微波背景光谱失真更敏感，并且与恒星冷却研究相比具有竞争力。作为一个副产品，我们还报告了中微子密度波动的一点概率分布函数的解析形式，从QUIJOTE模拟使用符号回归。
We study the possibility to use line-intensity mapping (LIM) to seek photons from the radiative decay of neutrinos in the cosmic neutrino background. The Standard Model prediction for the rate for these decays is extremely small, but it can be enhanced if new physics increases the neutrino electromagnetic moments. The decay photons will appear as an interloper of astrophysical spectral lines. We propose that the neutrinodecay line can be identified with anisotropies in LIM clustering and also with the voxel intensity distribution. Ongoing and future LIM experiments will have-depending on the neutrino hierarchy, transition, and experiment considered-a sensitivity to an effective electromagnetic transition moment similar to 10(-12) - 10(-8) (m(i)c(2)/0.1 eV)(3/2)mu(B), where m(i) is the mass of the decaying neutrino and mu(B) is the Bohr magneton. This will be significantly more sensitive than cosmic microwave background spectral distortions, and it will be competitive with stellar cooling studies. As a by-product, we also report an analytic form of the one-point probability distribution function for neutrino-density fluctuations, obtained from the QUIJOTE simulations using symbolic regression.