Super Heavy Dark Matter and UHECR Anisotropy at Low Energy

Abstract

Super Heavy quasi-stable particles are naturally produced in the early universe and could represent a substantial fraction of the Dark Matter: the so-called Super Heavy Dark Matter (SHDM). The decay of SHDM represents also a possible source of Ultra High Energy Cosmic Rays (UHECR), with a reliably calculated spectrum of the particles produced in the decay $(\propto E^{-1.9})$. The SHDM model for the production of UHECR can explain quantitatively only the excess of UHE events observed by AGASA. In the case of an observed spectrum not showing the AGASA excess the SHDM model can provide only a {\it subdominant} contribution to the UHECR flux. We discuss here the basic features of SHDM for the production of a {\it subdominant} UHECR flux, we refer our study to the possible signatures of the model at the Auger observatory discussing in particular the expected chemical composition and anisotropy.

18 pages, 14 eps figures, version accepted for publication in Astroparticle Physics

References in corpus (7)

• Upper limit on the ultra-high-energy photon flux from AGASA and Yakutsk data
• Anisotropy studies around the galactic centre at EeV energies with the Auger Observatory
• Upper limit on the photon fraction in highest-energy cosmic rays from AGASA data
• The Compton-Getting effect on ultra-high energy cosmic rays of cosmological origin
• The UHECR spectrum measured at the Pierre Auger Observatory and its astrophysical implications
• Constraints on top-down models for the origin of UHECRs from the Pierre Auger Observatory data
• Composition-sensitive parameters measured with the surface detector of the Pierre Auger Observatory

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• Hunting for super-heavy dark matter with the highest-energy cosmic rays
• Dark Matter and Gravity Waves from a Dark Big Bang
• Revisiting ultrahigh-energy constraints on decaying super-heavy dark matter
• Performance and science reach of POEMMA for ultrahigh-energy particles
• Supersymmetric superheavy dark matter
• Annihilations of superheavy dark matter in superdense clumps
• A global autocorrelation study after the first Auger data: impact on the number density of UHECR sources
• Ultra High Energy Cosmic Rays & Super-heavy Dark Matter
• Ultra high energy cosmic rays from super-heavy dark matter in the context of large exposure observatories
• Ultra High Energy Cosmic Rays -- an Overview
• Pierre Auger Observatory and Super Heavy Dark Matter
• Bounds from multi-messenger astronomy on the Super Heavy Dark Matter
• A relook at the GZK Neutrino-Photon Connection: Impact of Extra-galactic Radio Background & UHECR properties
• Search for photons at the Pierre Auger Observatory
• Neutrinos at extreme energies