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Galaxy Clusters as Reservoirs of Heavy Dark Matter and High-Energy Cosmic Rays: Constraints from Neutrino Observations
Kohta Murase, John F. Beacom
Galaxy Clusters (GCs) are the largest reservoirs of both dark matter and cosmic rays (CRs). Dark matter self-annihilation can lead to a high luminosity in gamma rays and neutrinos,…
New Sensitivity to Solar WIMP Annihilation using Low-Energy Neutrinos
Carsten Rott, Jennifer Siegal-Gaskins, John F. Beacom
Dark matter particles captured by the Sun through scattering may annihilate and produce neutrinos, which escape. Current searches are for the few high-energy neutrinos produced in…
Constraining Very Heavy Dark Matter Using Diffuse Backgrounds of Neutrinos and Cascaded Gamma Rays
Kohta Murase, John F. Beacom
We consider multi-messenger constraints on very heavy dark matter (VHDM) from recent Fermi gamma-ray and IceCube neutrino observations of isotropic background radiation. Fermi data…
The Star-Forming Galaxy Contribution to the Cosmic MeV and GeV Gamma-Ray Background
Brian C. Lacki, Shunsaku Horiuchi, John F. Beacom
While star-forming galaxies could be major contributors to the cosmic GeV -ray background, they are expected to be MeV-dim because of the "pion bump" falling off below ~100 MeV.…
Gamma-Ray and Neutrino Backgrounds as Probes of the High-Energy Universe: Hints of Cascades, General Constraints, and Implications for TeV Searches
Kohta Murase, John F. Beacom, Hajime Takami
Recent observations of isotropic diffuse backgrounds by Fermi and IceCube allow us to get more insight into distant very-high-energy (VHE) and ultra-high-energy (UHE) gamma-ray/neu…
Precise Relic WIMP Abundance and its Impact on Searches for Dark Matter Annihilation
Gary Steigman, Basudeb Dasgupta, John F. Beacom
If dark matter (DM) is a weakly interacting massive particle (WIMP) that is a thermal relic of the early Universe, then its total self-annihilation cross section is revealed by its…