Many different acceleration mechanisms: Fermi 1, Fermi 2, shear,... (Fermi acceleration at shock: most standard, nice powerlaw, few free parameters) main.
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Cosmology and Astrophysics (and Elementary Particle Physics in the 21 st Century) Cosmology and Astrophysics (and Elementary Particle Physics in the 21.
many different acceleration mechanisms: Fermi 1, Fermi 2, shear, ...