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Browsing by Author "Sigl, G"

Browsing by Author "Sigl, G"

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  • Extreme-energy cosmic rays: hints to new physics beyond the standard model? 
    Bhattacharjee, P; Sigl, G (Springer, 2001)
    The observed extreme energy cosmic ray (EECR) events above 10(20) eV are difficult to explain within tile standard scenario of origin of cosmic rays in which charged particles are accelerated in magnetized shocks in powerful ...
  • A Gap in the Highest Energy Cosmic Ray Spectrum as a Signature of Unification Scale Physics 
    Sigl, G; Lee, S; Schramm, D. N; Bhattacharjee, P (American Association for the Advancement of Science, 1995-12)
    Recent experimental data seem to indicate that there is significant structure in the cosmic ray spectrum above 1018 electron volts (eV). Besides a dip at ~5 x 1018 eV, two events above 2 x 1020 eV have been observed. The ...
  • Monopole annihilation and highest energy cosmic rays 
    Bhattacharjee, P; Sigl, G (The American Physical Society, 1995-04)
    Cosmic rays with energies exceeding 1020 eV have been detected. The origin of these highest energy cosmic rays remains unknown. Established astrophysical acceleration mechanisms encounter severe difficulties in accelerating ...
  • On the origin of highest energy cosmic rays 
    Sigl, G; Schramm, D. N; Bhattacharjee, P (Elsevier, 1994-09)
    In this paper we show that the conventional diffusive shock acceleration mechanism for cosmic rays associated with relativistic astrophysical shocks in active galactic nuclei (AGNs) has severe difficulties to explain the ...
  • Probing grand unified theories with cosmic-ray, gamma-ray, and neutrino astrophysics 
    Sigl, G; Lee, S; Bhattacharjee, P; Yoshida, S (The American astronomical Society, 1999-04)
    We explore scenarios where the highest energy cosmic rays are produced by new particle physics near the grand unification scale. Using detailed numerical simulations of extragalactic nucleon, γ-ray, and neutrino propagation, ...

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