Dark matter halos and the anisotropy of ultra-high energy cosmic rays

Tanco, G. A. Medina; Watson, Alan

doi:10.1016/s0927-6505(99)00071-7

Cited by 49 publications

(35 citation statements)

References 38 publications

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“…A large scale (dipole) anisotropy in this model is easily foreseeable, since the earth is off center in the Galaxy. The predicted large scale anisotropy is compatible with the observed one [29,30], mainly due to a lack of exposure in the direction of the galactic center. Based on the clustering properties of dark matter on smaller scales, we also discussed the recent results of [32] on the the small scale anisotropies.…”

Section: Discussionsupporting

confidence: 78%

“…In [29,30] this issue was considered more quantitatively, taking into account the exposure of the present experiments. All authors concur that the present data is consistent with Recently, an interesting pattern has arisen from the analysis of the events with energy larger than 4 × 10 19 eV: in [20] the sample with this energy cut comprises 47 events 3 , whose overall distribution in space does not show appreciable deviation from isotropy.…”

Section: Super Heavy Dark Matter: the Direct Connectionmentioning

confidence: 99%

“…As shown in [24,30], the total (energy integrated) flux of UHECRs per unit solid angle from a smooth distribution of dark matter particles in the halo is dΦ dΩ ∝ Rmax 0 dR n H (r(R)), where R is the distance from the detector, and r is the distance from the galactic center (so R and r are related by trigonometrical relations accounting for the off-center position of the Earth in the Galaxy). The upper limit, R max , depends on the line of sight.…”

Section: Super Heavy Dark Matter: the Direct Connectionmentioning

confidence: 99%

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Dark matter distribution in the universe and ultra-high energy cosmic rays

Blasi¹

2001

AIP Conference Proceedings

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Abstract. Two of the greatest mysteries of modern physics are the origin of the dark matter in the universe and the nature of the highest energy particles in the cosmic ray spectrum. We discuss here possible direct and indirect connections between these two problems, with particular attention to two cases: in the first we study the local clustering of possible sources of ultra-high energy cosmic rays (UHECRs) driven by the local dark matter overdensity. In the second case we study the possibility that UHECRs are directly generated by the decay of weakly unstable super heavy dark matter.

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Section: Discussionsupporting

confidence: 78%

Section: Super Heavy Dark Matter: the Direct Connectionmentioning

confidence: 99%

Section: Super Heavy Dark Matter: the Direct Connectionmentioning

confidence: 99%

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Dark matter distribution in the universe and ultra-high energy cosmic rays

Blasi¹

2001

AIP Conference Proceedings

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“…At present, the most interesting manifestation of SHDM may be the observations of UHECR beyond the GZK cutoff [1,2,15,16,17,18,19]. There are three basic signatures of UHECRs from SHDM:…”

Section: Introductionmentioning

confidence: 99%

Status of superheavy dark matter

Aloisio

Berezinsky

Kachelrieß³

2006

Phys. Rev. D

184

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Superheavy particles are a natural candidate for the dark matter in the universe and our galaxy, because they are produced generically during inflation in cosmologically interesting amounts. The most attractive model for the origin of superheavy dark matter (SHDM) is gravitational production at the end of inflation. The observed cosmological density of dark matter determines the mass of the SHDM particle as mX = (a few) ×1013 GeV, promoting it to a natural candidate for the source of the observed ultra-high energy cosmic rays (UHECR). After a review of the theoretical aspects of SHDM, we up-date its predictions for UHECR observations: no GZK cutoff, flat energy spectrum with dN/dE ≈ 1/E 1.9 , photon dominance and galactic anisotropy. We analyze the existing data and conclude that SDHM as explanation for the observed UHECRs is at present disfavored but not yet excluded. We calculate the anisotropy relevant for future Auger observations that should be the conclusive test for this model. Finally, we emphasize that negative results of searches for SHDM in UHECR do not disfavor SHDM as a dark matter candidate. Therefore, UHECRs produced by SHDM decays and with the signatures as described should be searched for in the future as subdominant effect.PACS numbers: 12.60. Jv, 95.35.+d, 98.35.Gi

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“…The possibility that the post GZK particles are locally produced in our galactic halo following the fate of cold matter is recently gaining more attention [4,35,34]. If the clustering is on scales smaller than the 50 Mpc scale the GZK cutoff effect on the spectrum will be mitigated.…”

Section: Fragmentation Originmentioning

confidence: 99%