Ultrahigh energy cosmic rays from dark matter annihilation

Dick, Rainer; Blasi, Pasquale; Kolb, Edward W.

doi:10.1016/s0920-5632(03)02106-6

Cited by 3 publications

(4 citation statements)

References 34 publications

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“…We have parametrized the unknown annihilation cross section already in terms of the unitarity bound (10). Now we would like to compare e.g.…”

Section: Calculation Of the Fluxmentioning

confidence: 99%

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Superheavy dark matter and ultrahigh-energy cosmic rays

Dick¹,

Hopp²,

Wunderle³

2006

Can. J. Phys.

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Abstract:The phase of inflationary expansion in the early universe produces superheavy relics in a mass window between 10 12 GeV and 10 14 GeV. Decay or annihilation of these superheavy relics can explain the observed ultrahigh energy cosmic rays beyond the GreisenZatsepin-Kuzmin cutoff. We emphasize that the pattern of cosmic ray arrival directions seen by the Pierre Auger observatory will decide between the different proposals for the origin of ultrahigh energy cosmic rays. PACS

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“…We have parametrized the unknown annihilation cross section already in terms of the unitarity bound (10). Now we would like to compare e.g.…”

Section: Calculation Of the Fluxmentioning

confidence: 99%

“…The so called top-down models of UHECRs combine both problems by proposing that ultrahigh energy cosmic rays arise in the decay [4,5,6,7,8] or collisional annihilation [9,10,11] of superheavy dark matter particles. We will use both the acronym SHDM and WIMPZILLA 1 for superheavy dark matter particles.…”

Section: Introductionmentioning

confidence: 99%

Superheavy dark matter and ultrahigh-energy cosmic rays

Dick¹,

Hopp²,

Wunderle³

2006

Can. J. Phys.

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“…The first crucial experimental test for our top-down model of SHDM annihilation in WIMPZILLA stars will be the observed anisotropy signature after a few years of operation of the Pierre Auger observatory [28]: If our annihilation model is correct, a pointlike source distribution should emerge with increasing source density towards the galactic center [20]. In particular, the majority of observed UHE events after about four years should appear in doublets or higher multiplets.…”

Section: Introductionmentioning

confidence: 99%

“…This had motivated the authors of Refs. [18][19][20] to propose collisional annihilation of free superheavy dark matter particles (SHDM particles, WIMPZILLAS) as another mechanism to generate UHECRs in our cosmic neighborhood.…”

Section: Introductionmentioning

confidence: 99%

Ultra-high-energy cosmic rays from collisional annihilation revisited

Dick

Hopp²,

Wunderle³

2005

Can. J. Phys.

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We re-examine collisional annihilation of superheavy dark matter particles in dark matter density spikes in the galactic halo as a possible source of ultrahigh energy cosmic rays. We estimate the possible flux in a way that does not depend on detailed assumptions about the density profiles of dark matter clumps. The result confirms that collisional annihilation is compatible with annihilation cross sections below the unitarity bounds for superheavy dark matter if the particles can form dense cores in dark matter substructure, and it provides estimates for core sizes and densities. The ensuing clumpy source distribution in the galactic halo will be tested within a few years of operation of the Pierre Auger observatory.

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