2022年1月10日
Photon escape in the extremal Kerr black hole spacetime
Physical Review D
- ,
- 巻
- 105
- 号
- 2
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevD.105.024031
- 出版者・発行元
- American Physical Society ({APS})
We consider necessary and sufficient conditions for photons emitted from an arbitrary spacetime position of the extremal Kerr black hole to escape to infinity. The radial equation of motion determines necessary conditions for photons emitted from r=r∗ to escape to infinity, and the polar angle equation of motion further restricts the allowed region of photon motion. From these two conditions, we provide a method to visualize a two-dimensional photon impact parameter space that allows photons to escape to infinity, i.e., the escapable region. Finally, we completely identify the escapable region for the extremal Kerr black hole spacetime. This study has generalized our previous result [K.~Ogasawara and T.~Igata, Phys. Rev. D \textbf{103}, 044029 (2021)], which focused only on light sources near the horizon, to the classification covering light sources in the entire region.
- リンク情報
- ID情報
-
- DOI : 10.1103/PhysRevD.105.024031
- ISSN : 2470-0010
- eISSN : 2470-0029
- ORCIDのPut Code : 106032936