Abstract
We discuss under what circumstances a signal in upcoming laboratory searches for keV-scale sterile neutrinos would be compatible with those particles being a sizable part or all of dark matter. In the parameter space that will be experimentally accessible by KATRIN/TRISTAN, strong X-ray limits need to be relaxed and dark matter overproduction needs to be avoided. We discuss postponing the dark matter production to lower temperatures, a reduced sterile neutrino contribution to dark matter, and a reduction of the branching ratio in photons and active neutrinos through cancellation with a new physics diagram. Both the Dodelson-Widrow and the Shi-Fuller mechanisms for sterile neutrino dark matter production are considered. As a final exotic example, potential consequences of CPT violation are discussed.
Highlights
The nature of dark matter (DM) is still an unsolved puzzle standing at the crossroads between cosmology, astrophysics and high energy physics
If sterile neutrinos represent 10% of DM, KATRIN is sensitive to ms ≃ 2–3 keV, while if this contribution reduces to 1% even larger masses can be reached, in such case Tc should not exceed Tc ≃ 10 MeV
We compare the lines which indicate the regions in parameter space where a certain amount of sterile neutrino DM is produced with modified x-ray constraints for those cases
Summary
The nature of dark matter (DM) is still an unsolved puzzle standing at the crossroads between cosmology, astrophysics and high energy physics. In one of the considered scenarios we will assume that sterile neutrinos may not be the only part of the DM density in the Universe.3 Another option that we study is the relaxation of x-ray constraints by interference of known decay channel with another process involving additional new physics.
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