251 citations · 2.2k across the 40 of their papers we have counts for
4 papers · 1 filter
Deflection angle in the strong deflection limit in a general asymptotically flat, static, spherically symmetric spacetime
Naoki Tsukamoto
Gravitational lensing by the light sphere of compact objects like black holes and wormholes will give us information on the compact objects. In this paper, we provide an improved s…
Retrolensing by a charged black hole
Naoki Tsukamoto, Yungui Gong
Compact objects with a light sphere such as black holes and wormholes can reflect light rays like a mirror. This gravitational lensing phenomenon is called retrolensing and it is a…
Strong deflection limit analysis and gravitational lensing of an Ellis wormhole
Naoki Tsukamoto
Observations of gravitational lenses in strong gravitational fields give us a clue to understanding dark compact objects. In this paper, we extend a method to obtain a deflection a…
Light curves of light rays passing through a wormhole
Naoki Tsukamoto, Tomohiro Harada
Gravitational lensing is a good probe into the topological structure of dark gravitating celestial objects. In this paper, we investigate the light curve of a light ray that passes…