For Johannsen-Psaltis spacetimes, the polar photon-ring time delay depends only on spin and shadow size, while the azimuthal shift probes the metric ratio F/N, enabling future spin and frame-dragging tests.
On Kerr black hole deformations admitting a Carter constant and an invariant criterion for the separability of the wave equation
1 Pith paper cite this work. Polarity classification is still indexing.
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abstract
In a previous work of ours, the most general family of Kerr deformations -- admitting a Carter constant -- has been presented. This time a simple, necessary and sufficient condition in order for the aforementioned family to have a separable Klein-Gordon equations is exhibited.
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2024 1verdicts
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Influence of Observer Inclination and Spacetime Structure on Photon Ring Observables
For Johannsen-Psaltis spacetimes, the polar photon-ring time delay depends only on spin and shadow size, while the azimuthal shift probes the metric ratio F/N, enabling future spin and frame-dragging tests.