Magnetic reconnection with a 0.1 rate: Effective resistivity in general relativistic magnetohydrodynamics
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arXiv
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| Format: | Preprint |
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2026
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| author | Ripperda, B. Grehan, M. P. Moran, A. Selvi, S. Sironi, L. Philippov, A. Bransgrove, A. Porth, O. |
| author_facet | Ripperda, B. Grehan, M. P. Moran, A. Selvi, S. Sironi, L. Philippov, A. Bransgrove, A. Porth, O. |
| contents | Relativistic magnetic reconnection is thought to power various multi-wavelength emission signatures from neutron stars and black holes. Relativistic resistive magnetohydrodynamics (RRMHD) offers the simplest model of reconnection. However, a small uniform resistivity underestimates the reconnection rate compared to first-principles kinetic models. By employing an effective resistivity based on kinetic models - which connects the reconnection electric field to the charge-starved current density - we show that RRMHD can reproduce the increased reconnection rate of kinetic models, both in local current sheets and in global black hole magnetospheres. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_02460 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Magnetic reconnection with a 0.1 rate: Effective resistivity in general relativistic magnetohydrodynamics Ripperda, B. Grehan, M. P. Moran, A. Selvi, S. Sironi, L. Philippov, A. Bransgrove, A. Porth, O. High Energy Astrophysical Phenomena Plasma Physics Relativistic magnetic reconnection is thought to power various multi-wavelength emission signatures from neutron stars and black holes. Relativistic resistive magnetohydrodynamics (RRMHD) offers the simplest model of reconnection. However, a small uniform resistivity underestimates the reconnection rate compared to first-principles kinetic models. By employing an effective resistivity based on kinetic models - which connects the reconnection electric field to the charge-starved current density - we show that RRMHD can reproduce the increased reconnection rate of kinetic models, both in local current sheets and in global black hole magnetospheres. |
| title | Magnetic reconnection with a 0.1 rate: Effective resistivity in general relativistic magnetohydrodynamics |
| topic | High Energy Astrophysical Phenomena Plasma Physics |
| url | https://arxiv.org/abs/2601.02460 |