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gr-qc2026
Probing Kerr spacetime via interferometric signatures of higher-order images
Fabiano Feleppa, Fabio Aratore, Valerio Bozza +1
Higher-order images produced by photons that orbit close to the unstable photon region of a black hole encode information about the spacetime geometry and leave characteristic sign…
gr-qc2026
Gravitational lensing by extremal rotating black holes in the strong deflection limit
Fabiano Feleppa, Valerio Bozza, Welmoed Marit de Graaf
In the strong deflection regime, light rays passing close to an astrophysical black hole may remain trapped near unstable photon orbits for a long time before escaping to infinity.…