Oscillations of sterile neutrinos from dark matter decay eliminates the IceCube-Fermi tension

Abstract

IceCube has observed a flux of cosmic neutrinos, with a "bump" in the energy range $10\lesssim E/\mathrm{TeV}\lesssim 100$ that creates a $3\sigma$ tension with gamma-ray data from the Fermi satellite. This has been interpreted as evidence for a population of hidden cosmic-ray accelerators. We propose an alternative explanation of this conundrum on the basis of cold dark matter which decays into sterile neutrinos that after oscillations produce the bump in the cosmic neutrino spectrum.

10 pages, 3 figures. Note added. In version 3 of arXiv:2011.01632, bounds on the decaying dark matter component are significantly relaxed. Since our fiducial values are comfortably consistent with the corrected bounds, our conclusions remain unchanged

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• Decay of multiple dark matter particles to dark radiation in different epochs does not alleviate the Hubble tension
• The Spectrum of Dark Radiation as a Probe of Reheating
• Indirect dark matter searches at ultrahigh energy neutrino detectors
• Using Secondary Tau Neutrinos to Probe Heavy Dark Matter Decays in Earth