Prospects for Finding Sterile Neutrino Dark Matter at KATRIN

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.

error in rescaling X-ray limits fixed; conclusions unchanged

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Cited by in corpus (17)

• Sterile Neutrinos
• Cosmological Dependence of Non-resonantly Produced Sterile Neutrinos
• KATRIN: Status and Prospects for the Neutrino Mass and Beyond
• Cosmology-friendly time-varying neutrino masses via the sterile neutrino portal
• Cosmological Dependence of Resonantly Produced Sterile Neutrinos
• Thermal axions with multi-eV masses are possible in low-reheating scenarios
• Axion-Sterile-Neutrino Dark Matter
• Development of a Silicon Drift Detector Array to Search for keV-scale Sterile Neutrinos with the KATRIN Experiment
• Synergy Between Hubble Tension Motivated Self-Interacting Neutrino and KeV-Sterile Neutrino Dark Matter
• Enhanced Muonization by Active-Sterile Neutrino Mixing in Protoneutron Stars
• Phasing out of Darkness: From Sterile Neutrino Dark Matter to Neutrino Masses via Time-Dependent Mixing
• Neutrino phenomenology and keV dark matter in 2HDM with $A_4$ symmetry
• Probing sterile neutrino dark matter in the PTOLEMY-like experiment
• Neutrinos in Astrophysics and Cosmology: Theoretical Advanced Study Institute (TASI) 2020 Lectures
• Theoretical and phenomenological consequences of active and sterile neutrino within Beyond Standard Model framework
• Structure Formation Limits on Axion-Like Dark Matter
• Sterile neutrino dark matter production in presence of non-standard neutrino self-interactions: an EFT approach