Sterile neutrinos in astrophysical neutrino flavor
Sterile neutrinos in astrophysical neutrino flavor
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DOI：
10.1088/1475-7516/2020/02/015
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发表时间：
2019-09
影响因子：
6.4
通讯作者：
C. Argüelles;K. Farrag;T. Katori;R. Khandelwal;S. Mandalia;J. Salvado
中科院分区：
文献类型：
--
作者：
C. Argüelles;K. Farrag;T. Katori;R. Khandelwal;S. Mandalia;J. Salvado
在本文中，我们研究了活性中微子-无菌中微子混合对预期高能天体物理中微子风味含量的影响。三活性中微子测量中的非统一性可能是由于惰性中微子态的存在。我们引入四味四面体的概念是为了可视化天体物理学中中微子三味三角形缺乏统一性。我们证明了活性无菌中微子混合改变了天体物理风味比的允许区域。然而，四味四面体的投影具有类似于三味三角形的相空间限制。另一方面，天体物理学中最初存在的惰性中微子极大地改变了这种情况，它允许在三味三角形空间中出现明显的单一性违反。利用当前的全局拟合约束，包括非统一情况，我们还说明了允许的天体物理中微子风味比。因此，对高能天体物理中微子风味含量的测量使我们能够独立于惰性中微子的质量尺度来探索惰性中微子。这些都是当前和未来中微子望远镜的研究课题。
In this paper, we study the effect of active-neutrino-sterile-neutrino mixing in the expected high-energy astrophysical neutrino flavor content. Non-unitarity in the measurement of the three-active neutrinos can be due to the existence of sterile neutrino states. We introduce the concept of the four-flavor tetrahedron in order to visualize the lack of unitarity in the astrophysical neutrino three-flavor triangle. We demonstrate that active-sterile neutrino mixings modify the allowed region of the astrophysical flavor ratio from the standard case. However, a projection of the four-flavor tetrahedron has restrictions of phase space similar to the three-flavor triangle. On the other hand, the initial presence of astrophysical sterile neutrinos drastically changes the scenario, and it allows an apparent unitarity violation in the three-flavor triangle space. Using current global fit constraints including the non-unitarity case, we also illustrate the allowed astrophysical neutrino flavor ratios. Thus, the measurement of the high-energy astrophyscal neutrino flavor content allows us to explore sterile neutrinos independently of the sterile neutrino mass scale. These are topics of investigation for current and future neutrino telescopes.