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.
Bayesian fitting to mock GRAVITY data shows robust detection of secondary images from Sgr A* flares requires both an order-of-magnitude larger sample and astrometric uncertainties reduced to 40% of current levels for |ΔBIC| > 7.9.
citing papers explorer
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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.
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Detectability of secondary images from flares near Sgr A* with mock GRAVITY data
Bayesian fitting to mock GRAVITY data shows robust detection of secondary images from Sgr A* flares requires both an order-of-magnitude larger sample and astrometric uncertainties reduced to 40% of current levels for |ΔBIC| > 7.9.