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

TL;DR

This paper proposes a PeV scale supersymmetric neutrino sector model that explains neutrino masses, sterile neutrino dark matter, the 3.5 keV X-ray line, and IceCube PeV neutrino events, linking these phenomena to a common new physics framework.

Contribution

It introduces a low energy seesaw mechanism with a new symmetry broken at the PeV scale, connecting neutrino masses, dark matter, and high-energy astrophysical anomalies.

Findings

Explains 3.5 keV X-ray line via sterile neutrino decay.

Accounts for IceCube PeV neutrino events.

Provides a unified framework linking neutrino physics and astrophysical signals.

Abstract

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