Elsevier

Physics Letters B

Volume 820, 10 September 2021, 136545
Physics Letters B

Rotating scalarized black holes in scalar couplings to two topological terms

https://doi.org/10.1016/j.physletb.2021.136545Get rights and content
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Abstract

The tachyonic instability of the Kerr black holes is analyzed in the Einstein-scalar theory with the quadratic scalar couplings to two topological terms which are parity-even Gauss-Bonnet and parity-odd Chern-Simons terms. For positive coupling α, we use the (2+1)-dimensional hyperboloidal foliation method to derive the threshold curve which is the boundary between stable and unstable Kerr black holes by considering a spherically symmetric scalar-mode perturbation. In case of negative coupling, a newly bound of a0.26 with a the rotation parameter is found for unstable Kerr black holes and its threshold curve is derived.

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