161 citations · 197 across the 2 of their papers we have counts for
2 papers
gr-qc2014★ 36 cited
Negative time delay of light by a gravitational concave lens
Koki Nakajima, Koji Izumi, Hideki Asada
Gravitational lens models, some of which might act as if a concave lens, have been recently investigated by using a static and spherically symmetric modified spacetime metric that…
gr-qc2012★ 161 cited
Deflection angle of light in an Ellis wormhole geometry
Koki Nakajima, Hideki Asada
We reexamine the light deflection by an Ellis wormhole. The bending angle as a function of the ratio between the impact parameter and the throat radius of the wormhole is obtained…