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- W4385305075 abstract "Decaying very-heavy dark matter (VHDM) particles at energies $gtrsim 10^9$ GeV can contribute to the ultrahigh-energy cosmic ray spectrum. However, the composition measurements by Pierre Auger Observatory indicate the presence of heavy-nuclei dominance at the highest energies. We constrain the flux of $p+overline{p}$ from Galactic and extragalactic VHDM using the latest spectrum and composition data and incorporating an astrophysical component. This provides improved limits on the VHDM decay timescale at $lesssim 10^{12}$ GeV. We also calculate the flux of UHE photons from VHDM decay and find that the constraints obtained using integral $gamma$-ray flux upper limits from Auger are more stringent by a factor of $sim10$. This improves our limits to VHDM lifetime by a factor of two compared to earlier studies." @default.
- W4385305075 created "2023-07-28" @default.
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- W4385305075 date "2023-07-25" @default.
- W4385305075 modified "2023-09-25" @default.
- W4385305075 title "Cosmic-ray and gamma-ray constraints on very-heavy dark matter decay" @default.
- W4385305075 doi "https://doi.org/10.22323/1.444.1487" @default.
- W4385305075 hasPublicationYear "2023" @default.
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