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arXiv 2007.15665gr-qcastro-ph.HEhep-th
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远离极端Kerr无力磁层的近视界吸引子

Moving away from the Near-Horizon Attractor of the Extreme Kerr Force-Free Magnetosphere

F. Camilloni, G. Grignani, T. Harmark, R. Oliveri, M. Orselli

摘要:

我们考虑极端克尔黑洞周围的无力磁层。在这种情况下,没有已知的精确解析解,力自由电动力学是固定的,轴对称的和磁主导的。然而,在零电磁场的近视界极端Kerr(NHEK)极限下,极端Kerr黑洞中任何稳定的、轴对称的、规则的无力磁层都趋近于同一个吸引子解。我们表明,通过移动远离吸引子解决方案在NHEK区域,一个发现磁主导的解决方案在极端克尔黑洞有限的角动量流出。这一结果是使用微扰分析达到二阶。

英文摘要:

We consider force-free magnetospheres around the extreme Kerr black hole. In this case there is no known exact analytic solution to force free electrodynamics which is stationary, axisymmetric and magnetically-dominated. However, any stationary, axisymmetric and regular force-free magnetosphere in extreme Kerr black hole approaches the same attractor solution in the near-horizon extreme Kerr (NHEK) limit with null electromagnetic field. We show that by moving away from the attractor solution in the NHEK region, one finds magnetically-dominated solutions in the extreme Kerr black hole with finite angular momentum outflow. This result is achieved using a perturbative analysis up to the second order.

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