On Lorentz Variability of Magnetically Dominated Relativistic Outflows
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866909972396244992 |
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| author | Berezhiani, V. I. Shatashvili, N. L. Tevzadze, A. G. |
| author_facet | Berezhiani, V. I. Shatashvili, N. L. Tevzadze, A. G. |
| contents | In this Letter, we show that magnetized relativistic outflows can exhibit a relativistic effect in which Lorentz transformation maps magnetic field topology into apparent temporal variability in the observer's frame. Using a force-free Beltrami configurations as representative equilibria of magnetically dominated outflows, we demonstrate that Lorentz mapping of stationary helical magnetic field produces quasi-periodic modulation of observable electromagnetic signatures, without invoking intrinsic plasma variability. This effect may be described as an aberration of force-free magnetic fields under Lorentz transformation. The characteristic frequency of the time variability is determined by the helical wave-number of the magnetic field, the viewing angle, and the bulk Lorentz factor of the jet outflow, and scales linearly with $Γ$. This establishes a purely kinematic relativistic origin of variability and introduces the concept of magnetic Lorentz seismology: the inference of magnetic field structure in relativistic outflows directly from observed temporal variability. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_18323 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | On Lorentz Variability of Magnetically Dominated Relativistic Outflows Berezhiani, V. I. Shatashvili, N. L. Tevzadze, A. G. High Energy Astrophysical Phenomena In this Letter, we show that magnetized relativistic outflows can exhibit a relativistic effect in which Lorentz transformation maps magnetic field topology into apparent temporal variability in the observer's frame. Using a force-free Beltrami configurations as representative equilibria of magnetically dominated outflows, we demonstrate that Lorentz mapping of stationary helical magnetic field produces quasi-periodic modulation of observable electromagnetic signatures, without invoking intrinsic plasma variability. This effect may be described as an aberration of force-free magnetic fields under Lorentz transformation. The characteristic frequency of the time variability is determined by the helical wave-number of the magnetic field, the viewing angle, and the bulk Lorentz factor of the jet outflow, and scales linearly with $Γ$. This establishes a purely kinematic relativistic origin of variability and introduces the concept of magnetic Lorentz seismology: the inference of magnetic field structure in relativistic outflows directly from observed temporal variability. |
| title | On Lorentz Variability of Magnetically Dominated Relativistic Outflows |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2512.18323 |