Constraints on metastable superheavy dark matter coupled to sterile neutrinos with the Pierre Auger Observatory Abdul Halim, A. Bueno Villar, Antonio Pierre Auger Collaboration, / Dark matter particles could be superheavy, provided their lifetime is much longer than the age of the Universe. Using the sensitivity of the Pierre Auger Observatory to ultrahigh energy neutrinos and photons, we constrain a specific extension of the Standard Model of particle physics that meets the lifetime requirement for a superheavy particle by coupling it to a sector of ultralight sterile neutrinos. Our results show that, for a typical dark coupling constant of 0.1, the mixing angle θm between active and sterile neutrinos must satisfy, roughly, θm ≲ 1.5 × 10−6(MX/109 GeV)−2 for a mass MX of the dark-matter particle between 108 GeV and 1011 GeV. 2024-09-04T07:40:12Z 2024-09-04T07:40:12Z 2024-04-08 journal article A. Abdul Halim et al. Constraints on metastable superheavy dark matter coupled to sterile neutrinos with the Pierre Auger Observatory. Phys. Rev. D 109, L081101 (2024) [10.1103/PhysRevD.109.L081101] https://hdl.handle.net/10481/93875 10.1103/PhysRevD.109.L081101 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional American Physical Society