251 citations · 2.2k across the 40 of their papers we have counts for
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gr-qc2023★ 8 cited
Comment on "Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A*"
Naoki Tsukamoto
Vagnozzi et al. constrained the additional parameter of spacetimes with a photon sphere from the observation of the shadow of Sagittarius A* under the assumption that a distance to…
gr-qc2023★ 5 cited
Relation between circular photon orbits and the stability of wormholes with the thin shell of a barotropic fluid
Naoki Tsukamoto, Takafumi Kokubu
We cut a general, static, spherically symmetric spacetime and paste its copy to make a wormhole with a thin shell of any barotropic fluid in general relativity. We show that the st…