Primary black-hole scalar charges and kinetic screening in $K$-essence-Gauss-Bonnet gravity
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| Format: | Preprint |
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2025
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| _version_ | 1866912794396327936 |
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| author | Lara, Guillermo Trenkler, Georg Trombetta, Leonardo G. |
| author_facet | Lara, Guillermo Trenkler, Georg Trombetta, Leonardo G. |
| contents | Black holes beyond General Relativity may carry non-standard charges that impact their phenomenology. We study how the scalar charge that is induced by the scalar-Gauss-Bonnet coupling is affected by the presence of a nontrivial kinetic term $K(X)$. We discuss the corresponding kinetic screening in the asymptotically flat, static solution first. We then turn to the case where self-accelerating cosmology is driven by $K(X)$, finding that the time-dependence of the scalar field opens up the parameter space, turning the black-hole scalar charge from secondary to primary. We provide a stability analysis and a measure of the intensity of the kinetic screening from the quartic dispersion relation of the mixed scalar and gravitational modes. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_23683 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Primary black-hole scalar charges and kinetic screening in $K$-essence-Gauss-Bonnet gravity Lara, Guillermo Trenkler, Georg Trombetta, Leonardo G. General Relativity and Quantum Cosmology Black holes beyond General Relativity may carry non-standard charges that impact their phenomenology. We study how the scalar charge that is induced by the scalar-Gauss-Bonnet coupling is affected by the presence of a nontrivial kinetic term $K(X)$. We discuss the corresponding kinetic screening in the asymptotically flat, static solution first. We then turn to the case where self-accelerating cosmology is driven by $K(X)$, finding that the time-dependence of the scalar field opens up the parameter space, turning the black-hole scalar charge from secondary to primary. We provide a stability analysis and a measure of the intensity of the kinetic screening from the quartic dispersion relation of the mixed scalar and gravitational modes. |
| title | Primary black-hole scalar charges and kinetic screening in $K$-essence-Gauss-Bonnet gravity |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2512.23683 |