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Black Hole Mergers as the Fastest Photon Ring Scramblers

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arxiv 2603.08643 v2 pith:UPEARRK5 submitted 2026-03-09 gr-qc astro-ph.COhep-phhep-th

Black Hole Mergers as the Fastest Photon Ring Scramblers

D. Giataganas , G.F. Giudice , A. Ianniccari , A.J. Iovino , A. Kehagias , F. Quevedo , D. Perrone , A. Riotto This is my paper
classification gr-qc astro-ph.COhep-phhep-th
keywords blackholesbinaryholemergersnullscramblersunstable
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Black holes are the most efficient scramblers in nature. By mapping the instantaneous mass and angular momentum of two spinless black holes in a quasi-circular binary onto those of an effective Kerr black hole, we demonstrate that the final state of the merger remnant corresponds with remarkable accuracy to the configuration that renders null geodesics unstable at the highest possible rate. This suggests a deep connection between the properties of black holes resulting from binary mergers and their unstable null orbits.

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  1. Black Hole Photon Rings Saturate the Quantum Chaos Bound

    hep-th 2026-05 unverdicted novelty 6.0

    Photon rings around black holes saturate the quantum chaos bound via Lyapunov exponents of null geodesics and OTOCs in the near-ring region.