Explaining the PeV Neutrino Fluxes at KM3NeT and IceCube with Quasiextremal Primordial Black Holes
Michael J. Baker (Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, USA); Joaquim Iguaz Juan (Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, USA); Aidan Symons (Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, USA); Andrea Thamm (Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, USA)
The KM3NeT experiment has recently observed a neutrino with an energy around 100 PeV, and IceCube has detected five neutrinos with energies above 1 PeV. While there are no known astrophysical sources, exploding primordial black holes could have produced these high-energy neutrinos. For Schwarzschild black holes this interpretation results in tensions between the burst rates inferred from the KM3NeT and IceCube observations, with indirect constraints from the extragalactic gamma-ray background and with the nonobservation of an associated gamma-ray signal at LHAASO. In this Letter we show that if there is a population of primordial black holes charged under a new dark symmetry which spend most of their time in a quasiextremal state, the neutrino emission at 1 PeV may be more suppressed than at 100 PeV. The burst rates implied by the KM3NeT and IceCube observations and the indirect constraints can then all be consistent at , and no associated gamma-ray signal was expected at LHAASO. Furthermore, these black holes could constitute all of the observed dark matter in the universe.
