Cosmic Necklaces and Ultrahigh Energy Cosmic Rays

Details Cosmic Necklaces and Ultrahigh Energy Cosmic Rays Cosmic Necklaces and Ultrahigh Energy Cosmic Rays

1997-04-25

arxiv.org/abs/astro-ph/9704257v1

Phys.Rev.Lett. 79 (1997) 5202-5205

Astronomy and Astrophysics

Astrophysics

10 pages, Revtex, 1 figure

Scientific paper

10.1103/PhysRevLett.79.5202

Cosmic necklaces are hybrid topological defects consisting of monopoles and strings, with two strings attached to each monopole. We argue that the cosmological evolution of necklaces may significantly differ from that of cosmic strings. The typical velocity of necklaces can be much smaller than the speed of light, and the characteristic scale of the network much smaller than the horizon. We estimate the flux of high-energy protons produced by monopole annihilation in the decaying closed loops. For some reasonable values of the parameters it is comparable to the observed flux of ultrahigh-energy cosmic rays.

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