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- W4205181527 abstract "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 the 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." @default.
- W4205181527 created "2022-01-26" @default.
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- W4205181527 date "2022-01-10" @default.
- W4205181527 modified "2023-10-17" @default.
- W4205181527 title "Photon escape in the extremal Kerr black hole spacetime" @default.
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- W4205181527 doi "https://doi.org/10.1103/physrevd.105.024031" @default.
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