Journal
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
Volume 17, Issue 10, Pages 1811-1817Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0218271808013443
Keywords
Shock waves; turbulence; particle acceleration
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I review recent results concerning the effects that relativistic parallel shocks can have on the particle-scattering turbulence, and how these effects, in turn, can change the shock's particle acceleration properties. I discuss the possibility of increased compression ratio due to this kind of turbulence transmission, and consider the effects of additional compression on the energy spectrum of the accelerated particles. Emphasis is put on the possibility of producing spectral indices that are significantly harder than what is usually expected from the first-order Fermi mechanism, but required by some observations. Finally, I discuss the physical requirements - and their plausibility in real astronomical objects - of this mechanism to have notable effects.
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