Maximal Efficiency of Collisional Penrose Process with Spinning Particle II

Abstract

We analyze the collisional Penrose process between a particle on the ISCO orbit around an extreme Kerr black hole and a particle impinging from infinity. We consider both cases with non-spinning and spinning particles. We evaluate the maximal efficiency, ${\eta }_{\text{max}}=(\text{extracted energy})/(\text{input energy})$, for the elastic collision of two massive particles and for the photoemission process, in which the ISCO particle will escape to infinity after the collision with a massless impinging particle. For non-spinning particles, the maximum efficiency is ${\eta }_{\text{max}}\approx 2.562$ for the elastic collision and ${\eta }_{\text{max}}\approx 7$ for the photoemission process. While for spinning particles we obtain the maximal efficiency ${\eta }_{\text{max}}\approx 8.442$ for the elastic collision and ${\eta }_{\text{max}}\approx 12.54$ for the photoemission process.

arXiv comment18 pages, 1 table, 7 figures; minor improvements, published version

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