Closed-form expressions for particle orbits and photon spheres are derived for a KR-NED black hole, with shadow radius consistent with EHT data and Hawking sparsity increased to ~1700 from 496.
Chandrasekhar,The Mathematical Theory of Black Holes (Oxford University Press, Oxford, 1983)
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Regular black holes in Einasto dark matter halos show the strongest deviations from Schwarzschild in photon sphere and shadow properties near a critical halo parameter, remaining consistent with Sgr A* but mildly disfavoring M87* at high values.
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Particle Dynamics, Shadow and Hawking Sparsity of a Kalb-Ramond Black Hole Coupled to Nonlinear Electrodynamics
Closed-form expressions for particle orbits and photon spheres are derived for a KR-NED black hole, with shadow radius consistent with EHT data and Hawking sparsity increased to ~1700 from 496.
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Strong-field signatures of a regular black hole in an Einasto dark matter halo
Regular black holes in Einasto dark matter halos show the strongest deviations from Schwarzschild in photon sphere and shadow properties near a critical halo parameter, remaining consistent with Sgr A* but mildly disfavoring M87* at high values.