The European Physical Journal C ( IF 4.2 ) Pub Date : 2023-08-09 , DOI: 10.1140/epjc/s10052-023-11858-4
Chandrachur Chakraborty , Parthasarathi Majumdar
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Inspired by the reported existence of substantive magnetic fields in the vicinity of the central supermassive black holes in Sagittarius A* and Messier 87*, we consider test particle motion in the spacetime close to a generic spherical black hole in the presence of magnetic fields in its vicinity. Modelling such a spacetime in terms of an axisymmetric, non-rotating Ernst–Melvin–Schwarzschild black hole geometry with appropriate parameters, we compute the geodesic nodal-plane precession frequency for a test particle with mass, for such a spacetime, and obtain a non-vanishing result, surpassing earlier folklore that only axisymmetric spacetimes with rotation (non-vanishing Kerr parameter) can generate such a precession. We call this magnetic field-generated phenomenon Gravitational Larmor Precession. What we present here is a Proof of Concept incipient assay, rather than a detailed analysis of supermassive black holes with magnetic fields in their neighbourhood. However, for completeness, we briefly discuss observational prospects of this precession in terms of available magnetic field strengths close to central black holes in galaxies.
中文翻译:
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引力拉莫尔进动
受到报告中人马座 A* 和 Messier 87* 中心超大质量黑洞附近存在实质性磁场的启发,我们考虑在普通球形黑洞附近存在磁场的情况下测试粒子在时空中的运动。附近。根据具有适当参数的轴对称、非旋转恩斯特-梅尔文-史瓦西黑洞几何结构对这样的时空进行建模,我们计算了具有质量的测试粒子在这样的时空的测地节点平面进动频率,并获得了非- 消失的结果,超越了早期的民间传说,即只有具有旋转的轴对称时空(非消失的克尔参数)才能产生这样的进动。我们将这种磁场产生的现象称为引力拉莫尔进动。我们在这里展示的是概念验证的初步分析,而不是对邻近磁场的超大质量黑洞的详细分析。然而,为了完整起见,我们根据星系中心黑洞附近的可用磁场强度来简要讨论这种进动的观测前景。