Hard component of ultra-high energy cosmic rays and vortons

Details Hard component of ultra-high energy cosmic rays and vortons Hard component of ultra-high energy cosmic rays and vortons

2000-05-31

arxiv.org/abs/astro-ph/0005593v2

Astropart.Phys. 16 (2002) 411-423

Astronomy and Astrophysics

Astrophysics

accepted version to appear in Astroparticle Physics. 24 pages, 3 figures. Enlarged discussion on vortons formation and GUT mod

Scientific paper

10.1016/S0927-6505(01)00119-0

Observed events of ultra-high energy cosmic rays may indicate a hard component for the energy spectrum of their flux, which might have origin in the decay of long-lived vortons presumably condensed in the galactic halo. To be consistent with the needed present density, vortons may have been formed during the breaking of an abelian symmetry contained in a large GUT group like E6 and a part of them could have survived the destabilization caused by the electroweak transition.

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