Dynamical hair growth in black hole binaries in Einstein-scalar-Gauss-Bonnet gravity
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866915770118701056 |
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| author | Capuano, Lodovico Saló, Llibert Aresté Doneva, Daniela D. Yazadjiev, Stoytcho S. Barausse, Enrico |
| author_facet | Capuano, Lodovico Saló, Llibert Aresté Doneva, Daniela D. Yazadjiev, Stoytcho S. Barausse, Enrico |
| contents | Within the framework of scalar-tensor theories of gravity, certain models can evade classical black hole no-hair theorems. A well-known example is Einstein-scalar-Gauss-Bonnet gravity, where black holes carrying a scalar charge can exist. We find that, within this theory, binary black holes initially described by General Relativity can acquire scalar charges once they reach a critical orbital separation ("dynamical scalarization"). We develop a simple semi-analytic model, based on the adiabatic conservation of the total Wald entropy, to estimate the scalar charge evolution during the binary inspiral. We also run fully nonlinear numerical-relativity simulations for different configurations, finding consistent results. The gravitational-wave phase difference between Einstein-scalar-Gauss-Bonnet and General Relativity waveforms, which we use to assess detectability, is also computed. We find that dynamical scalarization might be observable in nearly equal-mass binary black hole mergers with third-generation ground-based gravitational-wave detectors, in a narrow range of the dimensional coupling of the theory. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_02650 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Dynamical hair growth in black hole binaries in Einstein-scalar-Gauss-Bonnet gravity Capuano, Lodovico Saló, Llibert Aresté Doneva, Daniela D. Yazadjiev, Stoytcho S. Barausse, Enrico General Relativity and Quantum Cosmology Within the framework of scalar-tensor theories of gravity, certain models can evade classical black hole no-hair theorems. A well-known example is Einstein-scalar-Gauss-Bonnet gravity, where black holes carrying a scalar charge can exist. We find that, within this theory, binary black holes initially described by General Relativity can acquire scalar charges once they reach a critical orbital separation ("dynamical scalarization"). We develop a simple semi-analytic model, based on the adiabatic conservation of the total Wald entropy, to estimate the scalar charge evolution during the binary inspiral. We also run fully nonlinear numerical-relativity simulations for different configurations, finding consistent results. The gravitational-wave phase difference between Einstein-scalar-Gauss-Bonnet and General Relativity waveforms, which we use to assess detectability, is also computed. We find that dynamical scalarization might be observable in nearly equal-mass binary black hole mergers with third-generation ground-based gravitational-wave detectors, in a narrow range of the dimensional coupling of the theory. |
| title | Dynamical hair growth in black hole binaries in Einstein-scalar-Gauss-Bonnet gravity |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2602.02650 |