Regularized stable Kerr black hole: cosmic censorships, shadow and quasi-normal modes Rajes Ghosh, Mostafizur Rahman and Akash K. Mishra Eur. Phys. J. C, 83 1 (2023) 91 Published online: 30 January 2023 DOI: 10.1140/epjc/s10052-023-11252-0