3 papers
hep-th2026
Thermal Origin of Black Hole Quasinormal Modes
D. Giataganas, G. F. Giudice, A. Kehagias +2
When a black hole rings after a merger, it emits gravitational waves at characteristic frequencies known as quasinormal modes (QNMs). In the eikonal limit, these modes are governed…
hep-th2026
Black Hole Photon Rings Saturate the Quantum Chaos Bound
D. Giataganas, G. F. Giudice, A. Kehagias +2
We study the quantum chaos bound in the photon ring region surrounding black holes. By evaluating the Lyapunov exponent associated with unstable null geodesics in a broad class of…
gr-qc2026
Black Hole Mergers as the Fastest Photon Ring Scramblers
D. Giataganas, G. F. Giudice, A. Ianniccari +5
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…