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arXiv 1408.2452astro-ph.HE
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旋转黑洞附近的斜磁场和标架拖曳作用

Oblique magnetic fields and the role of frame dragging near rotating black hole

V. Karas, O. Kopacek, D. Kunneriath, J. Hamersky

摘要:

在强引力场和标架拖曳机制的共同作用下,旋转黑洞的能层边界附近会产生磁零点。感应电分量并不消失,可以发生有效的粒子加速过程。此外,施加的(弱)磁场的影响可以触发混沌的开始。该模型的设置似乎是相关的低吸积率核的一些星系,表现出情节吸积事件(如银河系的超大质量黑洞)嵌入在一个大规模的外部起源的磁场。我们回顾了我们最近的研究结果,我们提供了额外的背景下,未来的工作重点的作用,重力磁效应所造成的旋转的黑洞。虽然在经典黑洞时空中,测试运动是严格规则的,有或没有旋转或电荷的影响,引力扰动和施加的外部电磁场可能导致混沌。

英文摘要:

Magnetic null points can develop near the ergosphere boundary of a rotating black hole by the combined effects of strong gravitational field and the frame-dragging mechanism. The induced electric component does not vanish an efficient process of particle acceleration can occur. Furthermore, the effect of imposed (weak) magnetic field can trigger an onset of chaos. The model set-up appears to be relevant for low-accretion-rate nuclei of some galaxies which exhibit episodic accretion events (such as the Milky Way's supermassive black hole) embedded in a large-scale magnetic field of external origin. We review our recent results and we give additional context for future work with the focus on the role of gravito-magnetic effects caused by rotation of the black hole. While the test motion is strictly regular in the classical black hole space-time, with and without effects of rotation or electric charge, gravitational perturbations and imposed external electromagnetic fields may lead to chaos.

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