Browsing by Author "Sigl, G"

Now showing items 3-5 of 5

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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