Quasinormal modes and a new instability of Einstein-Gauss-Bonnet black holes in the de Sitter world

@article{Cuyubamba2016QuasinormalMA,
  title={Quasinormal modes and a new instability of Einstein-Gauss-Bonnet black holes in the de Sitter world},
  author={M. A. Cuyubamba and R. A. Konoplya and Alexander Zhidenko},
  journal={Physical Review D},
  year={2016},
  volume={93},
  pages={104053}
}
Analysis of time-domain profiles for gravitational perturbations shows that Gauss-Bonnet black holes in a de Sitter world possess a new kind of dynamical instability which does not take place for asymptotically flat Einstein-Gauss-Bonnet black holes. The new instability is in the gravitational perturbations of the scalar type and is due to the nonvanishing cosmological constant. Analysis of the quasinormal spectrum in the stability sector shows that although the scalar type of gravitational… 

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