One-dimensional linear analysis and numerical simulations of Alfven waves in a force-free magnetosphere around a Kerr black hole
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| Format: | Preprint |
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2025
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| _version_ | 1866916579293265920 |
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| author | Koide, Shinji Noda, Sousuke Takahashi, Masaaki |
| author_facet | Koide, Shinji Noda, Sousuke Takahashi, Masaaki |
| contents | We perform one-dimensional linear analysis and numerical simulations of the propagation of Alfven waves in a force-free magnetosphere along magnetic field lines around a spinning black hole. We use the results to investigate the dynamic process of wave propagation and energy transport for Alfven waves. As in a previous study using the Banados--Teitelboim--Zanelli spacetime (Koide et al. 2022), the Alfven wave induces a fast magnetosonic wave in the case of a spinning black hole. Energy conservation is confirmed when this additional induced magnetosonic wave is considered. We also observe the reflection of the inwardly propagating Alfven wave around the static limit, which is prohibited in theory when using the eikonal approximation. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2501_13314 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | One-dimensional linear analysis and numerical simulations of Alfven waves in a force-free magnetosphere around a Kerr black hole Koide, Shinji Noda, Sousuke Takahashi, Masaaki High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology We perform one-dimensional linear analysis and numerical simulations of the propagation of Alfven waves in a force-free magnetosphere along magnetic field lines around a spinning black hole. We use the results to investigate the dynamic process of wave propagation and energy transport for Alfven waves. As in a previous study using the Banados--Teitelboim--Zanelli spacetime (Koide et al. 2022), the Alfven wave induces a fast magnetosonic wave in the case of a spinning black hole. Energy conservation is confirmed when this additional induced magnetosonic wave is considered. We also observe the reflection of the inwardly propagating Alfven wave around the static limit, which is prohibited in theory when using the eikonal approximation. |
| title | One-dimensional linear analysis and numerical simulations of Alfven waves in a force-free magnetosphere around a Kerr black hole |
| topic | High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2501.13314 |