TY - JOUR

T1 - Maximal efficiency of the collisional Penrose process with spinning particles

AU - Maeda, Kei Ichi

AU - Okabayashi, Kazumasa

AU - Okawa, Hirotada

N1 - Funding Information:
We would like to thank Tomohiro Harada and Kota Ogasawara for useful discussions. This work was supported in part by JSPS KAKENHI Grants No. JP16K05362 (KM) and No. JP17H06359 (KM).

PY - 2018/9/14

Y1 - 2018/9/14

N2 - We analyze the collisional Penrose process of spinning test particles in an extreme Kerr black hole. We consider that two particles plunge into the black hole from infinity and collide near the black hole. For the collision of two massive particles, if the spins of particles are s1≈0.01379 μM and s2≈-0.2709 μM, we obtain the maximal efficiency is about ηmax=(extracted energy)/(input energy)≈15.01, which is more than twice as large as the case of the collision of non-spinning particles (ηmax≈6.32). We also evaluate the collision of a massless particle without spin and a massive particle with spin (Compton scattering), in which we find the maximal efficiency is ηmax≈26.85 when s2≈-0.2709 μM, which should be compared with ηmax≈13.93 for the nonspinning case.

AB - We analyze the collisional Penrose process of spinning test particles in an extreme Kerr black hole. We consider that two particles plunge into the black hole from infinity and collide near the black hole. For the collision of two massive particles, if the spins of particles are s1≈0.01379 μM and s2≈-0.2709 μM, we obtain the maximal efficiency is about ηmax=(extracted energy)/(input energy)≈15.01, which is more than twice as large as the case of the collision of non-spinning particles (ηmax≈6.32). We also evaluate the collision of a massless particle without spin and a massive particle with spin (Compton scattering), in which we find the maximal efficiency is ηmax≈26.85 when s2≈-0.2709 μM, which should be compared with ηmax≈13.93 for the nonspinning case.

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U2 - 10.1103/PhysRevD.98.064027

DO - 10.1103/PhysRevD.98.064027

M3 - Article

AN - SCOPUS:85054541482

VL - 98

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 6

M1 - 064027

ER -