7 citations · 13 across the 3 of their papers we have counts for
3 papers
gr-qc2024★ 6 cited
Correspondence between two gravitational lens equations in a static and spherically symmetric spacetime
Ryuya Kudo, Hideki Asada
Virbhadra and Ellis have proposed a very accurate equation (referred to as VE equation) for the gravitational lens in a static and spherically symmetric spacetime [Phys. Rev. D 62,…
gr-qc2023
Equivalence between definitions of the gravitational deflection angle of light for a stationary spacetime
Kaisei Takahashi, Ryuya Kudo, Keita Takizawa +1
The Gibbons-Werner-Ono-Ishihara-Asada method for gravitational lensing in a stationary spacetime has been recently reexamined [Huang and Cao, arXiv:2306.04145], in which the gravit…
gr-qc2022★ 7 cited
Nondivergent deflection of light around a photon sphere of a compact object
Ryuya Kudo, Hideki Asada
We demonstrate that the location of a stable photon sphere (PS) in a compact object is not always an edge such as the inner boundary of a black hole shadow, whereas the location of…