Electromagnetic Energy Extraction from Kerr Black Holes: Ab-Initio Calculations
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| Format: | Preprint |
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2025
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| _version_ | 1866916955941765120 |
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| author | Meringolo, Claudio Camilloni, Filippo Rezzolla, Luciano |
| author_facet | Meringolo, Claudio Camilloni, Filippo Rezzolla, Luciano |
| contents | The possibility of extracting energy from a rotating black hole via the Blandford-Znajek mechanism represents a cornerstone of relativistic astrophysics. We present general-relativistic collisionless kinetic simulations of Kerr black-hole magnetospheres covering a wide range in the black-hole spin. Considering a classical split-monopole magnetic field, we can reproduce with these ab-initio calculations the force-free electrodynamics of rotating black holes and measure the power of the jet launched as a function of the spin. The Blandford-Znajek luminosity we find is in very good agreement with analytic calculations and compatible with general-relativistic magnetohydrodynamics simulations via a simple rescaling. These results provide strong evidence of the robustness of the Blandford-Znajek mechanism and accurate estimates of the electromagnetic luminosity to be expected in those scenarios involving rotating black holes across the mass scale. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2507_08942 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Electromagnetic Energy Extraction from Kerr Black Holes: Ab-Initio Calculations Meringolo, Claudio Camilloni, Filippo Rezzolla, Luciano General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena Plasma Physics The possibility of extracting energy from a rotating black hole via the Blandford-Znajek mechanism represents a cornerstone of relativistic astrophysics. We present general-relativistic collisionless kinetic simulations of Kerr black-hole magnetospheres covering a wide range in the black-hole spin. Considering a classical split-monopole magnetic field, we can reproduce with these ab-initio calculations the force-free electrodynamics of rotating black holes and measure the power of the jet launched as a function of the spin. The Blandford-Znajek luminosity we find is in very good agreement with analytic calculations and compatible with general-relativistic magnetohydrodynamics simulations via a simple rescaling. These results provide strong evidence of the robustness of the Blandford-Znajek mechanism and accurate estimates of the electromagnetic luminosity to be expected in those scenarios involving rotating black holes across the mass scale. |
| title | Electromagnetic Energy Extraction from Kerr Black Holes: Ab-Initio Calculations |
| topic | General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena Plasma Physics |
| url | https://arxiv.org/abs/2507.08942 |