title: Testing the Dark Matter Scenario for PeV Neutrinos Observed in IceCube.
abstract: Late time decay of very heavy dark matter is considered as one of the possible explanations for diffuse PeV neutrinos observed in IceCube. We consider implications of multimessenger constraints, and show that proposed models are marginally consistent with the diffuse γ-ray background data. Critical tests are possible by a detailed analysis and identification of the sub-TeV isotropic diffuse γ-ray data observed by Fermi and future observations of sub-PeV γ rays by observatories like HAWC or Tibet AS+MD. In addition, with several-year observations by next-generation telescopes such as IceCube-Gen2, muon neutrino searches for nearby dark matter halos such as the Virgo cluster should allow us to rule out or support the dark matter models, independently of γ-ray and anisotropy tests.
authors: Center for Particle and Gravitational Astrophysics; Department of Physics; Department of Astronomy & Astrophysics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.|Institute for Advanced Study, Princeton, New Jersey 08540, USA.
authors: Kohta
authors: K
authors: Murase
authors: Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics, Stanford University, Stanford, California 94035, USA.
authors: Ranjan
authors: R
authors: Laha
authors: GRAPPA Institute, University of Amsterdam, Science Park 904, Amsterdam 1098 XH, Netherlands.
authors: Shin'ichiro
authors: S
authors: Ando
authors: Wisconsin IceCube Particle Astrophysics Center (WIPAC) and Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA.
authors: Markus
authors: M
authors: Ahlers