Blázquez Salcedo, José LuisKhoo, Fech ScenKunz, Jutta2024-02-052024-02-052017-09-062470-001010.1103/PhysRevD.96.064008https://hdl.handle.net/20.500.14352/98657We study quasinormal modes of static Einstein-Gauss-Bonnet-dilaton black holes. Both axial and polar perturbations are considered and studied from l = 0 to l = 3. We emphasize the difference in the spectrum between the Schwarzschild solutions and dilatonic black holes. At large Gauss-Bonnet coupling constant, a small secondary branch of black holes is present, when the dilaton coupling is sufficiently strong. The modes of the primary branch can differ from the Schwarzschild modes up to 10%. The secondary branch is unstable and possesses long-lived modes. We address the possible effects of these modes on future observations of gravitational waves emitted during the ringdown phase of astrophysical black holes.engjournal article2470-0029https://journals.aps.org/prd/abstract/10.1103/PhysRevD.96.064008open access53Física (Física)22 Física