Ultra high energy cosmic rays in the universe

Details Ultra high energy cosmic rays in the universe Ultra high energy cosmic rays in the universe

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001asthe..94..103t&link_type=abstract

The Astronomical Herald (ISSN 0374-2466), Vol. 94, No. 3, p. 103 - 112 (2001)

Astronomy and Astrophysics

Astronomy

Cosmic Rays: High Energy

Scientific paper

In this paper, we will discuss about important features of deca-joule energy cosmic rays, results from AGASA experiment and then, future projects, which will clarify the origin of deca-joule cosmic rays. The surprising fact is that cosmic rays with energies greater than 50 joules are traveling the universe. These charged particles should travel linearly even in the magnetic field fulfilled in the universe due to their ultra-high momenta, however, we can not identify any astronomical objects in their arrival directions. Furthermore, the energy of these cosmic rays is very close to the energy scale of Grand Unification Theory of elementary particles. Therefore, not only astronomical origin but also the exotic scenarios such as a decay of super heavy relics in our Dark Halo and the break of Lorentz invariance are seriously discussed recently.

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