Extends strong-deflection-limit analysis to power-divergent lensing by marginally unstable photon spheres in general static spherically symmetric asymptotically flat spacetimes and tests it on Reissner-Nordström and Hayward metrics.
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Simulations of photon rings around non-singular black holes from anisotropic fluids show they are difficult to distinguish from Schwarzschild black holes due to entangled theoretical, numerical, and observational uncertainties.
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Gravitational lensing inside and outside of a marginally unstable photon sphere in a general, static, spherically symmetric, and asymptotically-flat spacetime in strong deflection limits
Extends strong-deflection-limit analysis to power-divergent lensing by marginally unstable photon spheres in general static spherically symmetric asymptotically flat spacetimes and tests it on Reissner-Nordström and Hayward metrics.
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Observational appearance and photon rings of non-singular black holes from anisotropic fluids
Simulations of photon rings around non-singular black holes from anisotropic fluids show they are difficult to distinguish from Schwarzschild black holes due to entangled theoretical, numerical, and observational uncertainties.