Kazumasa Okabayashi

Dynamical photon sphere and time evolving shadow around black holes with temporal accretion

Yasutaka Koga, Nobuyuki Asaka, Masashi Kimura et al. · Physical review. D/Physical review. D. · 2022 · 31 citations · Full text

Natural Sciences, Physics, Astrophysics +15

Greybody factors imprinted on black hole ringdowns. II. Merging binary black holes

Kazumasa Okabayashi, Naritaka Oshita · Physical review. D/Physical review. D. · 2024 · 28 citations

Natural Sciences, Astronomy, Physics +14

Maximal efficiency of the collisional Penrose process with spinning particles

Kei-ichi Maeda, Kazumasa Okabayashi, H. Okawa · Physical review. D/Physical review. D. · 2018 · 22 citations · Full text

Natural Sciences, Physics, Astrophysics +11

Maximal efficiency of the collisional Penrose process with a spinning particle. II. Collision with a particle on the innermost stable circular orbit

Kazumasa Okabayashi, Kei-ichi Maeda · Progress of Theoretical and Experimental Physics · 2019 · 19 citations · Full text

Natural Sciences, Physics, Astrophysics +9

Resurgence in Lorentzian quantum cosmology: No-boundary saddles and resummation of quantum gravity corrections around tunneling saddle points

Masazumi Honda, Hiroki Matsui, Kazumasa Okabayashi et al. · Physical review. D/Physical review. D. · 2024 · 11 citations · Full text

Natural Sciences, Mathematics, Physics +14