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Maximal efficiency of the collisional Penrose process with a spinning particle. II. Collision with a particle on the innermost stable circular orbit by Okabayashi, Kazumasa; Maeda, Kei-ichi is a Physics and Astronomy article available to read on EtoBox.

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## Abstract We analyze the collisional Penrose process between a particle on the innermost stable circular orbit (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 a 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. 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.

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Author

Okabayashi, Kazumasa; Maeda, Kei-ichi

Publisher

Oxford University Press; [Oxford]: Oxford University Press on behalf of the Physical Society of Japan, 2013-; Oxford University Press (OUP) (ISSN 2050-3911)

Published

2020

Language

EN

Field

Physics and Astronomy (Physical Sciences)