251 citations · 2.2k across the 40 of their papers we have counts for
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Gravitational lensing by a Bronnikov-Kim wormhole under a weak-field approximation and in a strong deflection limit
Naoki Tsukamoto
We consider gravitational lensing under a weak-field approximation and in a strong deflection limit by a Bronnikov-Kim wormhole with the same metric as the one of a wormhole which…
Retrolensing by light rays slightly inside and outside of a photon sphere around a Reissner-Nordström naked singularity
Naoki Tsukamoto
We investigate retrolensing of sunlights reflected by a photon sphere and by a potential barrier near an antiphoton sphere around a Reissner-Nordström naked singularity. We apply t…
Gravitational lensing by a photon sphere in a Reissner-Nordström naked singularity spacetime in strong deflection limits
Naoki Tsukamoto
We investigate gravitational lensing by a photon sphere in a Reissner-Nordström naked singularity spacetime in strong deflection limits. Because of the nonexistence of an event hor…
Gravitational lensing by two photon spheres in a black-bounce spacetime in strong deflection limits
Naoki Tsukamoto
We investigate gravitational lensing by a primary photon sphere which is a sphere filled with unstable circular light orbits, and by a secondary photon sphere on a wormhole throat…
Linearization stability of reflection-asymmetric thin-shell wormholes with double shadows
Naoki Tsukamoto
Wormholes are hypothetical objects which can be black hole mimickers with strong gravitational fields. Recently, Wielgus et al. have constructed reflection-asymmetric thin-shell wo…