Kavli Affiliate: Shunsaku Horiuchi
| First 5 Authors: Garv Chauhan, Shunsaku Horiuchi, Patrick Huber, Ian M. Shoemaker,
| Summary:
Sterile neutrinos can be produced through mixing with active neutrinos in the
hot, dense core of a core-collapse supernova (SN). The standard bounds on the
active-sterile mixing ($sin^2 theta$) from SN arise from SN1987A energy-loss,
requiring $E_{text{loss}}<10^{52}~{rm erg}$. In this work, we discuss a novel
bound on sterile neutrino parameter space arising from the energy deposition
through its decays inside the SN envelope. Using the observed underluminous SN
IIP population, this energy deposition is constrained to be below $sim
10^{50}~{rm erg}$. Focusing on sterile neutrino mixing only with tau neutrino,
for heavy sterile masses $m_s$ in the range $100$-$500$ MeV, we find stringent
constraints on $sin^2 theta_tau$ reaching two orders of magnitude lower than
those from the SN1987A energy loss argument, {thereby probing the mixing angles
required for Type-I seesaw mechanism}. Similar bounds will also be applicable
to sterile mixing only with muons ($sin^2 theta_mu$).
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