We 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.
@article{arxiv.1706.03262,
title = {Quasinormal modes of Einstein-Gauss-Bonnet-dilaton black holes},
author = {Jose Luis Blázquez-Salcedo and Fech Scen Khoo and Jutta Kunz},
journal= {arXiv preprint arXiv:1706.03262},
year = {2017}
}
Comments
24 pages, 15 figures; v2: Minor changes to match version published in Phys. Rev. D