Scalar quasinormal modes of rotating black holes in parity-violating gravity
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| Main Authors: | , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866917312426147840 |
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| author | Tahara, Hiroaki W. H. Motohashi, Hayato Takahashi, Kazufumi Yingcharoenrat, Vicharit |
| author_facet | Tahara, Hiroaki W. H. Motohashi, Hayato Takahashi, Kazufumi Yingcharoenrat, Vicharit |
| contents | Recently, an exact rotating black hole solution in a parity-violating theory of gravity was obtained via a conformal transformation of the Kerr solution in general relativity, with parity-violating effects encoded in the conformal factor. We study the quasinormal modes (QNMs) of a test scalar field minimally coupled to gravity on this conformal Kerr background, treating the parity-violating effects perturbatively while allowing for arbitrary black hole spin, from the non-rotating case to the near-extremal regime. For low spin, we derive a perturbative formula for the QNM frequencies that includes the leading-order parity-violating correction. For high spin, particularly in the near-extremal regime, we find sizable deviations from the Kerr QNM frequencies. Our results point to a new avenue for probing parity-violating physics in the strong-gravity regime through black hole QNMs. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_03722 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Scalar quasinormal modes of rotating black holes in parity-violating gravity Tahara, Hiroaki W. H. Motohashi, Hayato Takahashi, Kazufumi Yingcharoenrat, Vicharit General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena High Energy Physics - Theory Recently, an exact rotating black hole solution in a parity-violating theory of gravity was obtained via a conformal transformation of the Kerr solution in general relativity, with parity-violating effects encoded in the conformal factor. We study the quasinormal modes (QNMs) of a test scalar field minimally coupled to gravity on this conformal Kerr background, treating the parity-violating effects perturbatively while allowing for arbitrary black hole spin, from the non-rotating case to the near-extremal regime. For low spin, we derive a perturbative formula for the QNM frequencies that includes the leading-order parity-violating correction. For high spin, particularly in the near-extremal regime, we find sizable deviations from the Kerr QNM frequencies. Our results point to a new avenue for probing parity-violating physics in the strong-gravity regime through black hole QNMs. |
| title | Scalar quasinormal modes of rotating black holes in parity-violating gravity |
| topic | General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena High Energy Physics - Theory |
| url | https://arxiv.org/abs/2603.03722 |