Stable spontaneously-scalarized black holes in generalized scalar-tensor theories
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2022
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| _version_ | 1866917834016161792 |
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| author | Antoniou, Georgios Macedo, Caio F. B. McManus, Ryan Sotiriou, Thomas P. |
| author_facet | Antoniou, Georgios Macedo, Caio F. B. McManus, Ryan Sotiriou, Thomas P. |
| contents | It has been shown that the synergy of a scalar field coupling with both the Ricci scalar and the Gauss-Bonnet invariant significantly affects the properties of scalarized black holes and neutron stars, including their domain of existence and the amount of scalar hair they carry. Here we study the radial stability of scalarized black-hole solutions. We demonstrate that they are stable against radial perturbations for Ricci couplings consistent with both a late-time cosmological attractor and the evasion of binary pulsar constraints. In addition, we investigate the effect of the Ricci coupling on the hyperbolicity of the equation governing linear, radial perturbations and show that it significantly reduces the region over which hyperbolicity is lost. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2204_01684 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Stable spontaneously-scalarized black holes in generalized scalar-tensor theories Antoniou, Georgios Macedo, Caio F. B. McManus, Ryan Sotiriou, Thomas P. General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena High Energy Physics - Theory It has been shown that the synergy of a scalar field coupling with both the Ricci scalar and the Gauss-Bonnet invariant significantly affects the properties of scalarized black holes and neutron stars, including their domain of existence and the amount of scalar hair they carry. Here we study the radial stability of scalarized black-hole solutions. We demonstrate that they are stable against radial perturbations for Ricci couplings consistent with both a late-time cosmological attractor and the evasion of binary pulsar constraints. In addition, we investigate the effect of the Ricci coupling on the hyperbolicity of the equation governing linear, radial perturbations and show that it significantly reduces the region over which hyperbolicity is lost. |
| title | Stable spontaneously-scalarized black holes in generalized scalar-tensor theories |
| topic | General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena High Energy Physics - Theory |
| url | https://arxiv.org/abs/2204.01684 |