Regularized Stable Kerr Black Hole: Cosmic Censorships, Shadow and Quasi-Normal Modes

Abstract

Black hole solutions in general relativity come with pathologies such as singularity and mass inflation instability, which are believed to be cured by a yet-to-be-found quantum theory of gravity. Without such consistent description, one may model theory-agnostic phenomenological black holes that bypass the aforesaid issues. These so-called regular black holes are extensively studied in the literature using parameterized modifications over the black hole solutions of general relativity. However, since there exist several ways to model such black holes, it is important to study the consistency and viability of these solutions from both theoretical and observational perspectives. In this work, we consider a recently proposed model of regularized stable rotating black holes having two extra parameters in addition to the mass and spin of a Kerr solution. We start by computing their quasi-normal modes under scalar perturbation and investigate the impact of those additional parameters on black hole stability. In the second part, we study the shadow structures of these regularized black holes and obtain stringent bounds on the parameter space requiring consistency with Event Horizon Telescope observations of $M87^{\ast }$ and $Sgr{A}^{\ast }$ shadows.

11 pages, 5 figures, 1 table, Journal Version

References in corpus (8)

• Rotating regular black holes
• Measurement of the Kerr Spin Parameter by Observation of a Compact Object's Shadow
• Generating rotating regular black hole solutions without complexification
• Rotating Regular Black Hole Solution
• Gedanken Experiments to Destroy a Black Hole II: Kerr-Newman Black Holes Cannot be Over-Charged or Over-Spun
• Dynamical renormalization of black-hole spacetimes
• Light rings of stationary spacetimes
• Parameterizations of black-hole spacetimes beyond circularity

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