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Ergosphere and shadow of a rotating regular black hole
Nuclear Physics B ( IF 2.8 ) Pub Date : 2020-06-09 , DOI: 10.1016/j.nuclphysb.2020.115088
Sushant G. Ghosh , Muhammed Amir , Sunil D. Maharaj

The spacetime singularities in classical general relativity predicted by the celebrated singularity theorems are formed at the end of gravitational collapse. Quantum gravity is the expected theory to resolve the singularity problem but we are now far from it. Therefore attention has shifted to models of regular black holes free from the singularities. A spherically symmetric regular toy model was obtained by Dymnikova (1992) which we demonstrate as an exact solution of Einstein's field equations coupled to nonlinear electrodynamics for a Lagrangian with parameter b related to magnetic charge. We construct rotating counterpart of this solution which encompasses the Kerr black hole as a special case when charge is switched off (b=0). Event Horizon Telescope has released the first image of supermassive black hole M87, revealing the structure near black hole horizon. The rotating regular black hole's shadow may be useful to determine strong field regime. We investigate ergosphere and black hole shadow of rotating regular black hole to infer that their sizes are sensitive to charge b and have a richer chaotic structure. In particular, rotating regular black hole possess larger size, but less distorted shadows when compared with Kerr black holes. We find one to one correspondence between ergosphere and shadow of the black hole.



中文翻译:

遍及旋转的规则黑洞的地球和阴影

由著名的奇点定理预测的古典广义相对论中的时空奇点是在重力坍塌的末尾形成的。量子引力是解决奇点问题的预期理论,但我们离它还很遥远。因此,注意力已经转移到没有奇点的规则黑洞模型上。Dymnikova(1992)获得了一个球对称的常规玩具模型,我们证明了作为参数的b与磁电荷有关的拉格朗日方程,爱因斯坦的场方程和非线性电动力学的精确解。我们构造了该解决方案的旋转副本,当电荷关闭时,该解决方案包含Kerr黑洞(作为特殊情况)(b=0)。事件视界望远镜已经发布了超大质量黑洞M87的第一张图像,露出近黑洞视界的结构。旋转的规则黑洞阴影可能对确定强电场状态很有用。我们研究了旋转规则的黑洞的整个地球和黑洞阴影,以推断它们的大小对电荷b敏感并且具有更丰富的混沌结构。特别地,与Kerr黑洞相比,旋转的规则黑洞具有较大的尺寸,但阴影失真较小。我们发现了人类活动圈与黑洞阴影之间的一一对应关系。

更新日期:2020-06-09
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