61 citations · 221 across the 14 of their papers we have counts for
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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…
gr-qc2023
Quasi-periodic relativistic shells in reflecting boundaries: How likely are black holes to form?
Takafumi Kokubu
A system of two gravitating bodies floating around a restricted region of strong gravitational field is investigated. We consider two concentric spherically symmetric timelike shel…