Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cpa..conf..200p&link_type=abstract
PROCEEDINGS OF THE 2002 INTERNATIONAL SYMPOSIUM ON COSMOLOGY AND PARTICLE ASTROPHYSICS (CosPA 02). Held 31 May ?2 June 2002 in T
Astronomy and Astrophysics
Astrophysics
Scientific paper
Although many ultra high energy (UHE) events with individual particle energy is beyond 4×1019 eV have been observed, the origin and signature of such ultra high energy cosmic rays (UHECRs) are still somewhat mysterious. How particles could obtain such enormous energies? In this paper, we present an effective acceleration mechanism for these UHE events based on super-massive stellar objects (SMSOs) with saturation of magnetic monopoles of t'Hooft-Polyakov type in the universe. These SMSOs have remarkable characteristics. Catalyzed by magnetic monopoles, nucleons may decay to energetic charged particles and radiation, and can travel to great distance from their source because of the absence of horizon and central singularity of SMSOs, due to the Rubakov-Callan effect. These rapidly rotating collapsed objects have radial magnetic fields in the local co-rotating frame. Moreover, the induced electromagnetic field in the rest frame is rather strong and quite different from the usual dipole field. As a result, the energetic charged particles may be further accelerated to 1021 eV. The denser the SMSO is, the higher the particle energy obtainable from our accelerator model becomes and the maximum particle energy may reach 1023 eV. The flux of UHECRs is briefly estimated by considering the production of protons and antiprotons via the interaction of the synchrotron photons with the thermal photons. The estimated flux of UHECRs from our theoretical model compares very favorably with the observed results.
Chou Chih-kang
Long Min
Peng Qiu-he
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