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The observed spectrum of ultrahigh energy neutrinos at IceCube might beindicative of absorption of such neutrinos in ultralight dark matter halos. Wepoint out that various features of this spectrum can be explained by suchabsorptions. For a light $Z^\prime$-mediated $t$-channel interaction betweendark matter and neutrinos, we propose a novel mechanism of absorption of theseneutrinos at particular energies. This can save the models of AGN predictinglarge neutrino flux at energies more than a PeV.

Are We Looking at Neutrino Absorption Spectra at IceCube?