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arXiv 0705.0246gr-qcastro-ph
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任意源距黑洞引力透镜的强偏转极限

Strong deflection limit of black hole gravitational lensing with arbitrary source distances

V. Bozza, G. Scarpetta

摘要:

超大质量黑洞的引力场能够强烈地弯曲附近光源发出的光线。当偏转角超过$π$时,引力透镜可以用所谓的强偏转角极限来解析近似。在本文中,我们删除了传统的假设非常远离黑洞的源,考虑源的距离作为一个额外的参数,在透镜问题要处理的准确。我们发现表达式的临界曲线,焦散线和所有透镜观测值有效的任何位置的源的地平线。在分析了球对称的情况下,我们集中在克尔黑洞,我们提出了一个分析的高阶焦散管的三维描述。

英文摘要:

The gravitational field of supermassive black holes is able to strongly bend light rays emitted by nearby sources. When the deflection angle exceeds $π$, gravitational lensing can be analytically approximated by the so-called strong deflection limit. In this paper we remove the conventional assumption of sources very far from the black hole, considering the distance of the source as an additional parameter in the lensing problem to be treated exactly. We find expressions for critical curves, caustics and all lensing observables valid for any position of the source up to the horizon. After analyzing the spherically symmetric case we focus on the Kerr black hole, for which we present an analytical 3-dimensional description of the higher order caustic tubes.

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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