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

Cosmic neutrino background search experiments as decaying dark matter detectors