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gr-qc2026
Gravitational lensing outside and inside of a marginally unstable photon sphere at a -symmetric wormhole throat in strong deflection limits
Naoki Tsukamoto
The deflection angles of rays diverge logarithmically near outside and inside of a photon sphere in usual strong deflection limits and the rays near the photon sphere could be dete…
gr-qc2026★ 2 cited
Strong-deflection expansion of the deflection angle near a degenerate photon sphere
Takahisa Igata, Tadashi Sasaki, Naoki Tsukamoto
We present a strong-deflection expansion for the deflection angle of light rays scattered near a degenerate photon sphere in asymptotically flat, static, and spherically symmetric…