Quasinormal modes of tensor perturbations of Kaluza-Klein black holes in Einstein-Gauss-Bonnet gravity

In Einstein-Gauss-Bonnet gravity, we study the quasinormal modes (QNMs) of the tensor perturbations for the so-called Maeda-Dadhich black hole which locally has a topology ${\ensuremath{\mathcal{M}}}^{n}\ensuremath{\simeq}{M}^{4}\ifmmode\times\else\texttimes\fi{}{\ensuremath{\mathcal{K}}}^{n\ensuremath{-}4}$. Our discussion is based on the tensor perturbation equation [L.-M. Cao and L.-B. Wu, Phys. Rev. D 103, 064054 (2021).], where the Kodama-Ishibashi gauge-invariant formalism for Einstein gravity theory has been generalized to the Einstein-Gauss-Bonnet gravity theory. With the help of characteristic tensors for the constant curvature space ${\ensuremath{\mathcal{K}}}^{n\ensuremath{-}4}$, we investigate the effect of extra dimensions and obtain the scalar equation in four-dimensional spacetime, which is quite different from the Klein-Gordon equation. Using the asymptotic iteration method and the numerical integration method with the Kumaresan-Tufts frequency extraction method, we numerically calculate the QNM frequencies. In our setups, characteristic frequencies depend on six distinct factors. They are the spacetime dimension $n$, the Gauss-Bonnet coupling constant $\ensuremath{\alpha}$, the black hole mass parameter $\ensuremath{\mu}$, the black hole charge parameter $q$, and two ``quantum numbers'' $l$, $\ensuremath{\gamma}$. Without loss of generality, the impact of each parameter on the characteristic frequencies is investigated while fixing the other five parameters. Interestingly, the dimension of the compactification part has no significant impact on the lifetime of QNMs.

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