Ultra high energy cosmic rays from super-heavy dark matter in the context of large exposure observatories

Abstract

The origin of the ultra high energy cosmic rays (UHECRs, $E>10^{18}$ eV) is still uncertain. However, great progress has been achieved due to the data taken by The Pierre Auger and Telescope Array observatories. The UHECR flux presents two main features, a hardening of the spectrum known as the ankle and a suppression at higher energies. The experimental data suggest that above the ankle the UHECRs flux is dominated by an extragalactic component of astrophysical origin. However, a minority component of exotic origin that dominates the flux beyond the suppression is still compatible with current data. Therefore, there exist the possibility that part of the UHECR flux originates from the decay of super-heavy dark matter particles clustered in the halos of the galaxies. In these scenarios the main contribution comes from the halo of our galaxy. In this article the possibility of identifying these scenarios in the context of the future very large exposure cosmic rays observatories is studied. It is worth mentioning that the contribution of the extragalactic halos located in the nearby universe is also included in these studies.

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Cited by in corpus (7)

• Ultra-High-Energy Cosmic Rays: The Intersection of the Cosmic and Energy Frontiers
• Cosmic Ray Extremely Distributed Observatory
• Revisiting ultrahigh-energy constraints on decaying super-heavy dark matter
• Constraints on the proton fraction of cosmic rays at the highest energies and the consequences for cosmogenic neutrinos and photons
• Search for heavy dark matter from dwarf spheroidal galaxies: leveraging cascades and subhalo models
• Bounds from multi-messenger astronomy on the Super Heavy Dark Matter
• New Options for SUSY-kind Dark Matter