Browsing by Author "Sigl, G"

Now showing items 4-5 of 5

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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