Quasinormal modes of a regular black hole with sub-Planckian curvature Dan Zhang, Huajie Gong, Guoyang Fu, Jian-Pin Wu and Qiyuan Pan Eur. Phys. J. C, 84 6 (2024) 564 Published online: 04 June 2024 DOI: 10.1140/epjc/s10052-024-12928-x