Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Probe Of Sterile Neutrinos Using Astrophysical Neutrino Flavor   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.

25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an