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Recent evidence for one or more gamma-ray lines at ∼ 130 GeV in the Fermi-LAT data from the Galactic Center has been interpreted as a hint for dark matter annihilation to Zγ or Hγ with an annihilation cross section of σv ∼ 10 −27 cm 3 s −1. We test this hypothesis by comparing synchrotron fluxes due to the electrons and positrons from decay of the Z or the(More)
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(More)
Galaxy clusters are one of the most promising candidate sites for dark matter annihilation. We focus on dark matter (χ) with mass in the range (10 GeV − 100 TeV), annihilating through the channels χχ → µ + µ − , χχ → ν ¯ ν, χχ → tt, or χχ → ν ¯ νν ¯ ν, and forecast the expected sensitivity to the annihilation cross section into these channels by observing(More)
Dark matter decays or annihilations that produce linelike spectra may be smoking-gun signals. However, even such distinctive signatures can be mimicked by astrophysical or instrumental causes. We show that velocity spectroscopy-the measurement of energy shifts induced by relative motion of source and observer-can separate these three causes with minimal(More)
The IceCube neutrino observatory has detected two cascade events with energies near 1 PeV [1, 2]. Without invoking new physics, we analyze the source of these neutrinos. We show that atmospheric conventional neutrinos and cosmogenic neutrinos (those produced in the propagation of ultra-high-energy cosmic rays) are strongly disfavored. For atmospheric prompt(More)
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