期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2020/02/015
关键词
neutrino astronomy; neutrino properties; neutrino theory; ultra high energy photons and neutrinos
资金
- NSF [PHY1912764]
- NExT/SEPnet Institute
- Science and Technology Facilities Council (STFC), United Kingdom (U.K.)
- Wisconsin IceCube Particle Astrophysics Center (WIPAC)
- Royal Society, U.K.
- EU Network FP10ITN ELUSIVES [H2020-MSCA-ITN-2015-674896]
- EU Network INVISIBLES-PLUS [H2020-MSCA-RISE2015-690575]
- MINECO [FPA2016-76005-C2-1-P]
- Maria de Maeztu grant of ICCUB [MDM-2014-0367]
- STFC [1643816] Funding Source: UKRI
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.
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