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Photon Rings Around Warped Black Holes
Daniel Kapec, Alexandru Lupsasca, Andrew Strominger
The black hole photon ring is a prime target for upcoming space-based VLBI missions seeking to image the fine structure of astrophysical black holes. The classical Lyapunov exponen…
Adaptive Analytical Ray Tracing of Black Hole Photon Rings
Alejandro Cárdenas-Avendaño, Alexandru Lupsasca, Hengrui Zhu
Recent interferometric observations by the Event Horizon Telescope have resolved the horizon-scale emission from sources in the vicinity of nearby supermassive black holes. Future…
Photon ring test of the Kerr hypothesis: Variation in the ring shape
Hadrien Paugnat, Alexandru Lupsasca, Frédéric Vincent +1
The Event Horizon Telescope (EHT) collaboration recently released horizon-scale images of the supermassive black hole M87*. These images are consistently described by an optically…
Holography of the Photon Ring
Shahar Hadar, Daniel Kapec, Alexandru Lupsasca +1
Space-based next-generation interferometers propose to measure the Lyapunov exponents of the nearly bound geodesics that comprise the photon ring surrounding the black hole M87*. W…