Constraining Dark Matter and Ultra-High Energy Cosmic Ray Sources with Fermi-LAT Diffuse Gamma Ray Background

Abstract

We use the recent measurement of the isotropic $\gamma$-ray background (IGRB) by Fermi LAT and analysis of the contribution of unresolved point $\gamma$-ray sources to IGRB to build constraints on the models of ultra-high cosmic rays (UHECR) origin. We also calculate the minimal expected diffuse $\gamma$-ray flux produced by UHECR interactions with an interstellar photon background. Finally, for the subclass of dark matter (DM) models with decaying weakly interacting massive particles (WIMP), we build constraints on the particle decay time using minimal expected contributions to the IGRB from unresolved point $\gamma$-ray sources and UHECR.

arXiv commentContribution to the Proceedings of 19th International Seminar on High Energy Physics, Quarks-2016, Pushkin, Russia, 29 May - 4 June, 2016

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Cited by in corpus (5)

• Gamma-ray Constraints on Decaying Dark Matter and Implications for IceCube
• The DAMPE excess and gamma-ray constraints
• Dark matter annihilation into leptons through gravity portals
• Observational constraints on dark matter decaying via gravity portals
• Constraints on the AGN flares as sources of ultra-high energy cosmic rays from the Fermi-LAT observations