http://arxiv.org/abs/2210.14506
The fundamental quasinormal modes of black holes in higher derivative gravity given by the Einstein-Weyl action are known to be moderately corrected by the Weyl term. Here we will show that the first several overtones are highly sensitive to even a relatively small Weyl correction, which might be important when representing the earlier stage of the black-hole ringdown. In addition, we have solved the problem related to analytical parametrized approximation of the numerical black hole solution in the Einstein-Weyl theory: In some range of parameters the approximation for the metric developed up to the third order lead to the unusual highly non-monotonic behavior of the frequencies. We have shown that this problem can be solved via the extension of the parametrization of the metric to higher orders until reaching the regime when the frequencies do not change with further increasing of the order.
R. Konoplya
Thu, 27 Oct 22
40/55
Comments: 7 pages, 3 figures, 2 tables, revtex
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