  IceCube has observed a flux of cosmic neutrinos, with a "bump" in the energy
range $10 \lesssim E/{\rm TeV} \lesssim 100$ 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.

High Energy Astrophysical Phenomena;High Energy Physics - Experiment;High Energy Physics - Phenomenology