251 citations · 2.2k across the 40 of their papers we have counts for
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gr-qc2020★ 117 cited
Gravitational lensing in the Simpson-Visser black-bounce spacetime in a strong deflection limit
Naoki Tsukamoto
A Simpson-Visser spacetime has two nonnegative parameters and and its metric is correspond with (i) a Schwarzschild metric for and , (ii) a regular black hole…
gr-qc2020★ 38 cited
Deflection angle of a light ray reflected by a general marginally unstable photon sphere in a strong deflection limit
Naoki Tsukamoto
We investigate the deflection angle in a strong deflection limit for a marginally unstable photon sphere in a general asymptotically flat, static and spherically symmetric spacetim…
gr-qc2020★ 36 cited
Nonlogarithmic divergence of a deflection angle by a marginally unstable photon sphere of the Damour-Solodukhin wormhole in a strong deflection limit
Naoki Tsukamoto
Static, spherically symmetric black holes and compact objects without an event horizon have unstable (stable) circular orbits of a light called photon (antiphoton) sphere. A Damour…