Three distinct non-minimal curvature-EM couplings produce different enlargements or reductions of black hole shadows and alter photon ring separations in characteristic ways.
Rotating black holes withoutZ 2 symmetry and their shadow images
3 Pith papers cite this work. Polarity classification is still indexing.
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Equatorial asymmetry in black hole spacetimes twists thick tori, displacing their centers and cusps away from the equatorial plane in the same direction as Keplerian orbits.
Lorentzian-Euclidean black holes produce excess inner-shadow intensity and accumulate energy at the horizon with backreaction unlike stable light rings.
citing papers explorer
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Photon rings and shadows of black holes with non-minimal couplings between curvature and electromagnetic field
Three distinct non-minimal curvature-EM couplings produce different enlargements or reductions of black hole shadows and alter photon ring separations in characteristic ways.
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Twisted doughnuts: Thick disk torus around equatorial asymmetric black hole
Equatorial asymmetry in black hole spacetimes twists thick tori, displacing their centers and cusps away from the equatorial plane in the same direction as Keplerian orbits.
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Shadow signatures and energy accumulation in Lorentzian-Euclidean black holes
Lorentzian-Euclidean black holes produce excess inner-shadow intensity and accumulate energy at the horizon with backreaction unlike stable light rings.