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gr-qc2026
Null-Energy Bounds on Photon-Orbit Instability in Einstein-Gauss-Bonnet Gravity
Sarandas A., C. Fairoos, C. L. Ahmed Rizwan
We derive a local upper bound on the coordinate-time Lyapunov exponent of unstable circular null orbits in static, spherically symmetric, asymptotically flat Einstein--Gauss--Bonne…
gr-qc2026
Bounds on the Lyapunov Exponent of Circular Null Orbits in -Dimensional Black-Hole Spacetimes
Anagha V., C. Fairoos, T. K. Safir
Unstable circular null orbits provide a geometric bridge between black-hole optics, photon rings, strong gravitational lensing, and the eikonal sector of quasinormal ringing. In fo…