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High Energy Astrophysics relates to the environment of compact objects that manifest themselves through the generation of non-thermal radiation from radio band up to very high energy gamma rays, cosmic ray generation up to the Ultra High Energy range (a few 1020eV ), very high energy neutrinos (as recorded now by Icecube observatory); in the future, we can expect the detection of Gravitational Waves produced by the formation of compact objects. There are two major physical processes that underline that manifestation, first the formation of relativistic jets, especially in the vicinity of Black Holes, second the formation of relativistic shocks that dissipate their energy with the production of electromagnetic turbulence and astroparticles. These two major processes are paradoxical in the sense that they do not rely on common physical sense and require some inquiry involving non trivial mechanism of General Relativity or non trivial mechanism of collisionless micro-physics. These two processes will be briefly presented with an update of their status.

Relativistic outflows from compact objects and generation of Astroparticles