A conformal freeze-in model with a neutrino portal can produce the observed dark matter abundance and, in part of its parameter space, the neutrino mass scale, while evading X-ray constraints for composite sterile-neutrino dark matter.
A Type II Supernovae Constraint on $\nu_e$-$\nu_s$
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abstract
The role of a resonant $\nu_e$-$\nu_s$ oscillation is discussed in the event of a supernova explosion. It is concluded that a significant $\nu_e$-$\nu_s$ mixing may hinder the ability of the supernova to explode. It may also cool the proto-neutron star too quickly with respect to the observed cooling time of several seconds. The constraints on the $\nu_e$-$\nu_s$ mixing parameters based on the above arguments are calculated.
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Conformal Freeze-In from Neutrino Portal
A conformal freeze-in model with a neutrino portal can produce the observed dark matter abundance and, in part of its parameter space, the neutrino mass scale, while evading X-ray constraints for composite sterile-neutrino dark matter.