Kota Ogasawara, Takahisa Igata. Photon escape in the extremal Kerr black hole spacetime. Physical Review D. 2022. 105. 2
Takahisa Igata, Kazunori Kohri, Kota Ogasawara. Photon emission from inside the innermost stable circular orbit. Physical Review D. 2021. 103. 10
Kota Ogasawara, Takahisa Igata. Complete classification of photon escape in the Kerr black hole spacetime. Physical Review D. 2021. 103. 4
Takahisa Igata, Keisuke Nakashi, Kota Ogasawara. Observability of the innermost stable circular orbit in a near-extremal Kerr black hole. Physical Review D. 2020. 101. 4
Kota Ogasawara, Takahisa Igata, Tomohiro Harada, Umpei Miyamoto. Escape probability of a photon emitted near the black hole horizon. Physical Review D. 2020. 101. 4