Super-Penrose process for extremal charged white holes

Abstract

© 2020 World Scientific Publishing Company. We consider collision of two particles 1 and 2 near the horizon of the extremal Reissner-Nordström (RN) black hole that produces two other particles 3 and 4. There exists such a scenario that both new particles fall into a black hole. One of them emerges from the white hole horizon in the asymptotically flat region, and the other one oscillates between turning points. However, the unbounded energies E at infinity (super-Penrose process (SPP)) turn out to be impossible for any finite angular momenta L3,4. In this sense, the situation for such a white hole scenarios is opposite to the black hole ones, where the SPP is found earlier to be possible for the RN metric even for all Li = 0. However, if L3,4 themselves are unbounded, the SPP does exist for white holes.