Strong-field gravitational lensing around rotating black holes whose interior singularity is smoothed into a non-singular Minkowski core (rotating Bardeen and Hayward metrics). Students learn how the deflection angle of prograde and retrograde photons and the resulting relativistic-image observables - position, separation, magnification, and time delays - depend on the regularity parameter, and how these compare with the Kerr black hole when the lens is modeled as the supermassive black holes M87* or SgrA*.
This Physics Letters B article computes strong-field gravitational-lensing observables for two families of rotating regular black holes whose central singularity is replaced by a non-singular Minkows…