Astrophysical signatures of rotating Kazakov-Solodukhin black holes: shadows and constraints from EHT observations
Bekzod Rahmatov, Islom Egamberdiev, Otabek Umarov, Murodbek Vapayev, Shavkat Karshiboev, Yunus Turaev, Sardor Murodov
Abstract
We investigate the astrophysical properties of the rotating Kazakov-Solodukhin (KS) black hole, a quantum-corrected extension of the Schwarzschild solution that removes the central singularity via an effective mass function. Extending the KS solution to the rotating case, we analyze its geodesic structure and explore the influence of the quantum correction parameter on observable quantities. In particular, we study the effective mass profile, the ergoregion, and photon motion, and compute the black hole shadow. Comparing the resulting shadows with the classical Kerr solution, we find that quantum corrections tend to enlarge the shadow radius and alter its shape. Using these theoretical predictions, we further constrain the parameter space of the rotating KS black hole by confronting the shadow properties with Event Horizon Telescope (EHT) observations of M87* and Sgr A*. Our results demonstrate that high-resolution black hole imaging provides a promising avenue for probing semiclassical modifications of general relativity.