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…