Ultra-High Energy Cosmic Rays: The Annihilation of Super-Heavy Relics

Details Ultra-High Energy Cosmic Rays: The Annihilation of Super-Heavy Relics Ultra-High Energy Cosmic Rays: The Annihilation of Super-Heavy Relics

2001-11-28

arxiv.org/abs/astro-ph/0111531v1

Nucl.Phys.Proc.Suppl. 110 (2002) 494-496

Astronomy and Astrophysics

Astrophysics

To appear in the proceedings of the TAUP conference, September 8-12, 2001 - Gran Sasso Laboratory, Italy

Scientific paper

We investigate the possibility that ultra-high energy cosmic rays (UHECRs) originate from the annihilation of relic superheavy (SH) dark matter in the Galactic halo. In order to fit the data on UHECRs, a cross section of $<\sigma_Av>\sim 10^{-26}\textrm{cm}^2 (M_X/10^{12} \textrm{GeV})^{3/2}$ is required if the SH dark matter follows a Navarro--Frenk--White (NFW) density profile. This would require extremely large-$l$ contributions to the annihilation cross section. An interesting finding of our calculation is that the annihilation in sub-galactic clumps of dark matter dominates over the annihilations in the smooth dark matter halo, thus implying much smaller values of the cross section needed to explain the observed fluxes of UHECRs.

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