Gravitational mode mixing around black holes in scalar-tensor theories with parity-violating terms
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arXiv
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866912244086865920 |
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| author | Hirano, Shin'ichi Kimura, Masashi Yamaguchi, Masahide |
| author_facet | Hirano, Shin'ichi Kimura, Masashi Yamaguchi, Masahide |
| contents | We investigate black holes and gravitational perturbations when both the scalar Gauss-Bonnet and dynamical Chern-Simons gravity sectors coexist in addition to the Einstein-Hilbert term, and both sectors are coupled to a single canonically normalized scalar field. The presence of the scalar Gauss-Bonnet gravity sector allows the scalar field to possess a non-vanishing background solution, resulting in additional couplings between odd and even-type gravitational perturbations arising from the dynamical Chern-Simons gravity sector. We illustrate the impact of these even-odd gravitational couplings in gravitational perturbations around a static spherically symmetric black hole. Although the couplings between the odd and even-type gravitational perturbations are known to appear in purely tensorial gravity theories with higher curvature corrections, we demonstrate it in scalar-tensor theories. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_07039 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Gravitational mode mixing around black holes in scalar-tensor theories with parity-violating terms Hirano, Shin'ichi Kimura, Masashi Yamaguchi, Masahide General Relativity and Quantum Cosmology High Energy Physics - Theory We investigate black holes and gravitational perturbations when both the scalar Gauss-Bonnet and dynamical Chern-Simons gravity sectors coexist in addition to the Einstein-Hilbert term, and both sectors are coupled to a single canonically normalized scalar field. The presence of the scalar Gauss-Bonnet gravity sector allows the scalar field to possess a non-vanishing background solution, resulting in additional couplings between odd and even-type gravitational perturbations arising from the dynamical Chern-Simons gravity sector. We illustrate the impact of these even-odd gravitational couplings in gravitational perturbations around a static spherically symmetric black hole. Although the couplings between the odd and even-type gravitational perturbations are known to appear in purely tensorial gravity theories with higher curvature corrections, we demonstrate it in scalar-tensor theories. |
| title | Gravitational mode mixing around black holes in scalar-tensor theories with parity-violating terms |
| topic | General Relativity and Quantum Cosmology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2404.07039 |