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arXiv 2007.15662gr-qcastro-ph.HEhep-th
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Kerr黑洞近视界极限和近极限的无力磁层吸引子

Force-free magnetosphere attractors for near-horizon extreme and near-extreme limits of Kerr black hole

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

摘要:

我们提出了一种新的方法来寻找磁主导的力免费磁层周围的高度旋转的黑洞,相关的天体物理喷流模型。利用Kerr黑洞的近视界极端Kerr(NHEK)极限,在NHEK极限下,任意稳定的、轴对称的、规则的无力磁层都可退化为相同的吸引子解.我们使用这个吸引子的解决方案作为从NHEK区域在极端克尔时空扰动的普遍起点。我们证明,通过去二阶微扰理论,有可能找到磁主导磁层周围的极端克尔黑洞。此外,我们认为近视界近极端克尔(近NHEK)限制,提供了一个不同的制度,高度旋转的黑洞。同样在这种情况下,我们发现了一个新的无力吸引子,它可以被用来作为一个普遍的出发点的无力磁层的微扰建设。最后讨论了NHEK吸引子与near-NHEK吸引子之间的关系。

英文摘要:

We propose a new approach to find magnetically-dominated force-free magnetospheres around highly spinning black holes, relevant for models of astrophysical jets. Employing the near-horizon extreme Kerr (NHEK) limit of the Kerr black hole, any stationary, axisymmetric and regular force-free magnetosphere reduces to the same attractor solution in the NHEK limit with null electromagnetic field strength. We use this attractor solution as the universal starting point for perturbing away from the NHEK region in the extreme Kerr spacetime. We demonstrate that by going to second order in perturbation theory, it is possible to find magnetically dominated magnetospheres around the extreme Kerr black hole. Furthermore, we consider the near-horizon near-extreme Kerr (near-NHEK) limit that provides access to a different regime of highly spinning black holes. Also in this case we find a novel force-free attractor, which can be used as the universal starting point for a perturbative construction of force-free magnetospheres. Finally, we discuss the relation between the NHEK and near-NHEK attractors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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