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Neutrino masses and light (keV-GeV) sterile neutrinos can arise naturally viaa modified, low energy seesaw mechanism if the right-handed neutrinos arecharged under a new symmetry broken by a PeV scale vacuum expectation value,presumably tied to supersymmetry breaking. The additional field content alsoallows for freeze-in production of sterile neutrino dark matter. This frameworkcan accommodate the recently observed 3.5 keV X-ray line, while astraightforward extension of the framework, using the new symmetry and the PeVenergy scale, can explain the PeV energy neutrino events at IceCube. Together,these can therefore be taken as hints of the existence of a PeV scalesupersymmetric neutrino sector.

Hints of a PeV Scale Supersymmetric Neutrino Sector: Neutrino Masses, Dark Matter, keV and PeV Anomalies