Petrov type, principal null directions, and Killing tensors of slowly rotating black holes in quadratic gravity
Petrov type, principal null directions, and Killing tensors of slowly rotating black holes in quadratic gravity
复制标题
二次引力中缓慢旋转黑洞的 Petrov 型、主零方向和杀死张量
DOI:
10.1103/physrevd.103.124057
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发表时间:
2021
影响因子:
5
通讯作者:
Witek, Helvi
中科院分区:
文献类型:
--
作者:
Owen, Caroline B.;Yunes, Nicolás;Witek, Helvi
The ability to test general relativity in extreme gravity regimes using gravitational wave observations from current ground-based or future space-based detectors motivates the mathematical study of the symmetries of black holes in modified theories of gravity. In this paper we focus on spinning black hole solutions in two quadratic gravity theories: dynamical Chern-Simons and scalar Gauss-Bonnet gravity. We compute the principal null directions, Weyl scalars, and complex null tetrad in the small-coupling, slow rotation approximation for both theories, confirming that both spacetimes are Petrov type I. Additionally, we solve the Killing equation through rank 6 in dynamical Chern-Simons gravity and rank 2 in scalar Gauss-Bonnet gravity, showing that there is no nontrivial Killing tensor through those ranks for each theory. We therefore conjecture that the still-unknown, exact, quadratic-gravity, black-hole solutions do not possess a fourth constant of motion.
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