Ghosh, RajesRajesGhoshFranchini, NicolaNicolaFranchiniVolkel, Sebastian H.Sebastian H.VolkelBarausse, EnricoEnricoBarausse2025-08-222025-08-222023-02-012331-8422http://arxiv.org/abs/2303.00088https://d8.irins.org/handle/IITG2025/18483en-USQuasi-normal modes of non-separable perturbation equations: the scalar non-Kerr casee-Printe-Print123456789/615