Painlevé-Gullstrand coordinates discontinuity in the quantum Oppenheimer-Snyder model / Papers New / By Qiss Francesco Fazzini, Carlo Rovelli, Farshid Soltani CPT Marseille, UWO London, Perimeter Institute Preprint: 2307.07797 Journal: Phys. Rev. D 108, 044009 (2023)