Constraints on the flux of $\sim (10^{16}-10^{17.5})$ eV cosmic photons from the EAS-MSU muon data

Abstract

Results of the search for $\sim (10^{16}-10^{17.5})$ eV primary cosmic-ray photons with the data of the Moscow State University (MSU) Extensive Air Shower (EAS) array are reported. The full-scale reanalysis of the data with modern simulations of the installation does not confirm previous indications of the excess of gamma-ray candidate events. Upper limits on the corresponding gamma-ray flux are presented. The limits are the most stringent published ones at energies $\sim 10^{17}$ eV.

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• Constraints on the models of the origin of high-energy astrophysical neutrinos
• Constraints on heavy decaying dark matter with current gamma-ray measurements
• Searches for Ultra-High-Energy Photons at the Pierre Auger Observatory
• Diffuse flux of ultra-high energy photons from cosmic-ray interactions in the disk of the Galaxy and implications for the search for decaying super-heavy dark matter
• Near-future discovery of point sources of ultra-high-energy neutrinos
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• Search for a diffuse flux of photons with energies above tens of PeV at the Pierre Auger Observatory
• Astrophysical constraints from synchrotron emission on very massive decaying dark matter
• Linking the KM3-230213A Neutrino Event to Dark Matter Decay and Gravitational Wave signals