Scalarized Kerr-Newman black holes develop an inner photon shell that produces an additional critical curve and distinct crescent-like higher-order images unlike those in Kerr spacetime.
Dynamical features and shadows of quantum Schwarzschild black hole in effective field theories of gravity.Eur
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Electromagnetic perturbations in Schwarzschild spacetime reduce to a Helmholtz equation with a derived position- and frequency-dependent refractive index encoding gravitational redshift, curvature, and angular momentum.
The shadow of a Kerr-Newman-like black hole in Bumblebee gravity with plasma is analyzed via observables and constrained by M87* EHT data, with spin and Lorentz violation mainly distorting the shape while charge and plasma shrink the size.
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Optical Appearance of Scalarized Kerr-Newman Black Holes with Multiple Light Rings
Scalarized Kerr-Newman black holes develop an inner photon shell that produces an additional critical curve and distinct crescent-like higher-order images unlike those in Kerr spacetime.
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Electromagnetic wave propagation in static black hole spacetimes: an effective refractive index description in Schwarzschild geometry
Electromagnetic perturbations in Schwarzschild spacetime reduce to a Helmholtz equation with a derived position- and frequency-dependent refractive index encoding gravitational redshift, curvature, and angular momentum.
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Photon regions, shadow observables and constraints from M87* of a Kerr-Newman-like black hole in Bumblebee gravity surrounded by plasma
The shadow of a Kerr-Newman-like black hole in Bumblebee gravity with plasma is analyzed via observables and constrained by M87* EHT data, with spin and Lorentz violation mainly distorting the shape while charge and plasma shrink the size.