Cosmic neutrino background search experiments as decaying dark matter detectors

Abstract

We investigate the possibility that particles that are long-lived on cosmological scales, making up part or all of the dark matter, decay to neutrinos that have present-day energies around an eV. The neutrinos from these decays can potentially be visible at experiments that hope to directly observe the cosmic neutrino background through neutrino capture on tritium, such as PTOLEMY. In the context of a simple model that can realize such decays, we discuss the allowed signatures at a PTOLEMY-like experiment given current cosmological constraints.

8 pages, 3 figures. v2: references added, typos corrected, published version

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• Diraxiogenesis
• Thermal production of cold "hot dark matter" around eV
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• Dark Radiation from Inflationary Fluctuations
• Probing sterile neutrino dark matter in the PTOLEMY-like experiment
• Probing the Cosmic Neutrino Background and New Physics with TeV-Scale Astrophysical Neutrinos
• Primordial high energy neutrinos: theoretical/observational constraints and sharp spectral features