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Energetics of particle collisions near dirty rotating extremal black holes: Banados-Silk-West effect versus Penrose process
If two particles collide near the horizon of a rotating extremal black hole, under certain conditions the energy ${E}_{\mathrm{c}.\mathrm{m}.}$ in the center-of-mass frame can grow without limit (the so-called Banados-Silk-West effect). We consider collisions that produce two other particles. We show that for a generic dirty (surrounded by matter) black …