Kavli Affiliate: Shunsaku Horiuchi
| First 5 Authors: Kanji Mori, Tomoya Takiwaki, Kei Kotake, Shunsaku Horiuchi,
| Summary:
Core-collapse supernovae can be a copious source of sterile neutrinos,
hypothetical particles that mix with active neutrinos. We develop
two-dimensional stellar core-collapse models that incorporate the mixing
between tau neutrinos and heavy sterile neutrinos — those with the mass of
150–200 MeV — to investigate signatures of sterile neutrinos in supernova
observables. We find that the decay channel of a sterile neutrino into a pion
and a tau neutrino can enhance the explosion energy and the synthesized nickel
mass. Although the inclusion of sterile neutrinos considered in this study
slightly reduce the neutrino and gravitational-wave signals, we find that they
are still detectable for a Galactic event. Furthermore, we point out that if
sterile neutrinos are as massive as ~200 MeV, they produce high-energy tau
antineutrinos with energies of ~80 MeV, the detection of which can be a smoking
signature of the sterile neutrinos and where Hyper-Kamiokande should play a
pivotal role.
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