The perturbation solutions to the Blandford-Znajek mechanism in the Kerr-Sen black hole
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866910040061902848 |
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| author | Feng, Haiyuan Cai, Ziqiang Yang, Rong-Jia Zhang, Jinjun |
| author_facet | Feng, Haiyuan Cai, Ziqiang Yang, Rong-Jia Zhang, Jinjun |
| contents | We investigate the steady, axisymmetric, force-free magnetosphere of Kerr-Sen black hole (BH) within the framework of the Einstein-Maxwell-dilaton-axion (EMDA) theory. By perturbatively solving the nonlinear Grad-Shafranov (GS) equation, we determine the magnetic field configuration and quantify the influence of the dilaton parameter $r_2$ on the energy extraction rate and radiative efficiency. Our results show that both the energy extraction power and the radiative efficiency increase with $r_2$, exceeding those of the standard Kerr BH, whereas the extraction efficiency remain consistent with the Kerr case. In addition, we perform $χ^2$ statistical analysis using observational data from six binary BH systems, which indicates that the Kerr BH currently provides a better fit for bulk Lorentz factors $Γ= 2$ and $5$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_03391 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The perturbation solutions to the Blandford-Znajek mechanism in the Kerr-Sen black hole Feng, Haiyuan Cai, Ziqiang Yang, Rong-Jia Zhang, Jinjun General Relativity and Quantum Cosmology We investigate the steady, axisymmetric, force-free magnetosphere of Kerr-Sen black hole (BH) within the framework of the Einstein-Maxwell-dilaton-axion (EMDA) theory. By perturbatively solving the nonlinear Grad-Shafranov (GS) equation, we determine the magnetic field configuration and quantify the influence of the dilaton parameter $r_2$ on the energy extraction rate and radiative efficiency. Our results show that both the energy extraction power and the radiative efficiency increase with $r_2$, exceeding those of the standard Kerr BH, whereas the extraction efficiency remain consistent with the Kerr case. In addition, we perform $χ^2$ statistical analysis using observational data from six binary BH systems, which indicates that the Kerr BH currently provides a better fit for bulk Lorentz factors $Γ= 2$ and $5$. |
| title | The perturbation solutions to the Blandford-Znajek mechanism in the Kerr-Sen black hole |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2603.03391 |