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(A)v) similar to 10(-26)cm(2)(M-X/10(12) 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.

Ultra-high energy cosmic rays: The annihilation of super-heavy relics

Blasi P;
2002

Abstract

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(A)v) similar to 10(-26)cm(2)(M-X/10(12) 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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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12571/1755
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