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Penrose Compton scattering (PCS) is a type of Compton scattering that can occur within a black hole's ergosphere. Interaction of a photon with a charged particle orbiting in an ergosphere (e.g., an electron) can result in the photon's leaving the ergosphere with much higher energy, a process which could produce X-rays and gamma rays. It has been theorized to produce spectral signatures of active galactic nuclei (AGNs), e.g., of quasars and Seyfert galaxies.
Penrose pair production (PPP) is photon-photon pair production from high energy photons within the ergosphere that results in an electron or positron emitted from the black hole at relativistic speed. The photons could be from the Penrose Compton scattering, which potentially makes the process self-sustaining, a mechanism that has been termed the Penrose photoproduction process. Due to other strong-field gravitational effects, it possibly could result in a collimated beam of electrons and positrons and could be one mechanism involved in relativistic jets