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gr-qc2026
Chaos and fractals of the black hole photon ring
Roman Berens, Peter Galison, Trevor Gravely +2
The photon ring of a Kerr black hole decomposes into a self-similar hierarchy of subrings. Here, we show that this self-similar structure persists in phase space. Moreover, near th…
gr-qc2024★ 9 cited
The Black Hole Explorer: Using the Photon Ring to Visualize Spacetime Around the Black Hole
Peter Galison, Michael D. Johnson, Alexandru Lupsasca +2
The Black Hole Explorer (BHEX), an orbiting, multi-band, millimeter radio-telescope, in hybrid combination with millimeter terrestrial radio-telescopes, is designed to discover and…