Keisuke Nakashi, Masashi Kimura, Hayato Motohashi, Kazufumi Takahashi. Black hole ringdown from physically sensible initial value problem in higher-order scalar-tensor theories. Phys.Rev.D. 2024. 109. 2. 024034-024034
Keisuke Nakashi, Masashi Kimura, Hayato Motohashi, Kazufumi Takahashi. Black hole perturbations in higher-order scalar-tensor theories: initial value problem and dynamical stability. Classical and Quantum Gravity. 2022. 39. 17. 175003-175003
Keisuke Ota, Shinpei Kobayashi, Keisuke Nakashi. Revisiting timelike geodesics in the Fisher-Janis-Newman-Winicour-Wyman spacetime. Physical Review D. 2022. 105. 2
Yasutaka Koga, Takahisa Igata, Keisuke Nakashi. Photon surfaces in less symmetric spacetimes. Physical Review D. 2021. 103. 4
Keisuke Nakashi, Masashi Kimura. Towards rotating noncircular black holes in string-inspired gravity. Physical Review D. 2020. 102. 8
Black hole perturbations in higher-order scalar-tensor theories: initial value problem and dynamical stability
(Gravity: Current challenges in black hole physics and cosmology 2022)