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arXiv · 2304.14304

Quasinormal Modes from EFT of Black Hole Perturbations with Timelike Scalar Profile

Shinji Mukohyama·Kazufumi Takahashi·Keitaro Tomikawa·Vicharit Yingcharoenrat
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Abstract

The Effective Field Theory (EFT) of perturbations on an arbitrary background geometry with a timelike scalar profile was recently constructed in the context of scalar-tensor theories. In this paper, we use this EFT to study quasinormal frequencies of odd-parity perturbations on a static and spherically symmetric black hole background. Keeping a set of operators that can accommodate shift-symmetric quadratic higher-order scalar-tensor theories, we demonstrate the computation for two examples of hairy black holes, of which one is the stealth Schwarzschild solution and the other is the Hayward metric accompanied by a non-trivial scalar field. We emphasize that this is the first phenomenological application of the EFT, opening a new possibility to test general relativity and modified gravity theories in the strong gravity regime.

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Shinji Mukohyama, Kazufumi Takahashi, Keitaro Tomikawa, Vicharit Yingcharoenrat. 2023-04-27. Quasinormal Modes from EFT of Black Hole Perturbations with Timelike Scalar Profile. https://doi.org/10.1088/1475-7516%2F2023%2F07%2F050

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