Ranjan Laha

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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)
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〉 ∼ 10−27cm3 s−1. We test this hypothesis by comparing synchrotron fluxes due to the electrons and positrons from decay of the Z or the H(More)
Ranjan Laha, 2 John F. Beacom, 2, 3 Basudeb Dasgupta, Shunsaku Horiuchi, and Kohta Murase Center for Cosmology and AstroParticle Physics (CCAPP), Ohio State University, Columbus, OH 43210 Department of Physics, Ohio State University, Columbus, OH 43210 Department of Astronomy, Ohio State University, Columbus, OH 43210 International Center for Theoretical(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 → νν̄, χχ → tt, or χχ → νν̄νν̄, and forecast the expected sensitivity to the annihilation cross section into these channels by observing galaxy(More)
Kenny C. Y. Ng, 2 Ranjan Laha, 2 Sheldon Campbell, 2 Shunsaku Horiuchi, Basudeb Dasgupta, Kohta Murase, and John F. Beacom 2, 6 Center for Cosmology and AstroParticle Physics (CCAPP), Ohio State University, Columbus, OH 43210 Department of Physics, Ohio State University, Columbus, OH 43210 Center for Cosmology, Department of Physics and Astronomy,(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)
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