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Capturing low-energy electron antineutrinos on radioactive Ho-163 nuclei,which decay into Dy-163 via electron capture (EC), is a noteworthy opportunityto detect relic sterile antineutrinos. Such hypothetical particles are more orless implied by current experimental and cosmological data, and they might be apart of hot dark matter or a candidate for warm dark matter in the Universe.Using the isotope Ho-163 as a target and assuming reasonable active-sterileantineutrino mixing angles, we calculate the capture rate of relic electronantineutrinos against the corresponding EC-decay background in the presence ofsterile antineutrinos at the sub-eV or keV mass scale. We show that thesignature of hot or warm sterile antineutrino dark matter should in principlebe observable, provided the target is big enough and the energy resolution isgood enough.

Captures of Hot and Warm Sterile Antineutrino Dark Matter on EC-decaying Ho-163 Nuclei