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Late time decay of very heavy dark matter is considered as one of thepossible explanations for diffuse PeV neutrinos observed in IceCube. Weconsider implications of multimessenger constraints, and show that proposedmodels are marginally consistent with the diffuse gamma-ray background data.Critical tests are possible by a detailed analysis and identification of thesub-TeV isotropic diffuse gamma-ray data observed by Fermi and futureobservations of sub-PeV gamma rays by observatories like HAWC or Tibet AS+MD.In addition, with several-year observations by next-generation telescopes suchas IceCube-Gen2, muon neutrino searches for nearby dark matter halos such asthe Virgo cluster should allow us to rule out or support the dark mattermodels, independently of gamma-ray and anisotropy tests.

Testing the Dark Matter Scenario for PeV Neutrinos Observed in IceCube