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Disappointing model for ultrahigh-energy cosmic rays · Around

2011

Disappointing model for ultrahigh-energy cosmic rays

Aloisio, R., Berezinsky, V., Gazizov, A.

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Data of Pierre Auger Observatory show a proton-dominated chemical composition of ultrahigh-energy cosmic rays spectrum at (1 - 3) EeV and a steadily heavier composition with energy increasing.

In order to explain this feature we assume that (1 - 3) EeV protons are extragalactic and derive their maximum acceleration energy, E_p^{max} \simeq 4 EeV, compatible with both the spectrum and the composition.
We also assume the rigidity-dependent acceleration mechanism of heavier nuclei, E_A^{max} = Z x E_p^{max}.
The proposed model has rather disappointing consequences: i) no pion photo-production on CMB photons in extragalactic space and hence ii) no high-energy cosmogenic neutrino fluxes; iii) no GZK-cutoff in the spectrum; iv) no correlation with nearby sources due to nuclei deflection in the galactic magnetic fields up to highest energies.

Built on

Greisen K 1966 Phys. Rev. Lett
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Zatsepin G T and Kuzmin V A 1966 JETP Lett
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Berezinsky V S and Grigor’eva S I 1988 Astron. Astrophys
1988
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Berezinsky V, Gazizov A Z and Grigorieva S I 2002 ( astro-ph/0210095 )
2002
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Aloisio R and Berezinsky V 2004 Astrophys. J
2004
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Berezinsky V, Gazizov A Z and Grigorieva S I 2005 Phys. Lett
2005
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Berezinsky V, Gazizov A Z and Grigorieva S I 2006 Phys. Rev
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Ostapchenko S 2006 Phys. Rev
2006
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Then

Unger M 2009 SOCoR 2009, http://web.phys.ntnu.no/
2009
Later among the works it cites.
Bellido J A 2009 Proceedings of the 31st ICRC, ŁODŻ 2009
2009
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Aloisio R, Berezinsky V and Gazizov A 2009 Astrophys. J
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Sokolsky P (HiRes) 2010 (arXiv: 1010.2690 )
2010
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Abraham J et al
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Aloisio R, Berezinsky V and Grigorieva S 2010 (arXiv: 1006.2484 )
2010
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Aloisio R, Berezinsky V and Gazizov A 2011 Astropart.Phys
2011

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