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511 keV line constraints on feebly interacting particles from supernovae
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Feebly interacting particles with masses with O(10-100) MeV can be copiously produced by core-collapse supernovae (SNe). In this paper we consider the case of MeV-ish sterile neutrinos and dark photons mixed with ordinary neutrinos and photons, respectively. Furthermore, both sterile neutrinos and dark photons may decay into positrons on their route to Earth. Such positrons would annihilate with electrons in the Galactic medium and contribute to the photon flux in the 511 keV line. Using the SPI (SPectrometer on INTEGRAL) observation of this line improves the bounds on the mixing parameters for these particles by several orders of magnitude below what is already excluded by the SN 1987A energy-loss argument.
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In-flight positron annihilation as a probe of feebly interacting particles
In-flight annihilation of positrons produced by supernova feebly interacting particles gives the strongest astrophysical bounds on their electron couplings for masses of roughly 10-200 MeV, covering ALPs, sterile neut...
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