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arXiv 1608.05948gr-qc
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变形黑洞的几何学:I. Majumdar-Papapetrou双星

On geometry of deformed black holes: I. Majumdar-Papapetrou binary

O. Semerák, M. Basovník

摘要:

虽然黑洞是非常强引力的突出表现,但它们周围甚至内部的时空几何形状都可能受到周围存在的其他物体的显著影响。我们研究这样的静态和轴对称(电)真空时空爱因斯坦方程的精确解描述的影响,考虑天体物理学动机的配置(如黑洞包围环),以及那些纯粹的学术兴趣(如专门“调谐”系统的多个黑洞)。几何是由最简单的不变量表示的,这些不变量由度量(lapse函数)及其梯度(引力加速度)决定,特别强调曲率(Kretschmann和Ricci平方标量)。这些量进行了分析,并绘制了它们的水平表面以上和以下的黑洞视界,特别是附近的中心奇点。估计黑洞可能受到另一个黑洞的影响最强烈,我们在第一篇论文中重点关注二元黑洞的Majumdar-Papapetrou解,并比较了由“另一个”洞(和静电场)引起的变形。与著名的Kerr和Kerr-Newman解中的旋转拖曳引起的变形。

英文摘要:

Although black holes are eminent manifestations of very strong gravity, the geometry of space-time around and even inside them can be significantly affected by additional bodies present in their surroundings. We study such an influence within static and axially symmetric (electro-)vacuum space-times described by exact solutions of Einstein's equations, considering astrophysically motivated configurations (such as black holes surrounded by rings) as well as those of pure academic interest (such as specifically "tuned" systems of multiple black holes). The geometry is represented by the simplest invariants determined by the metric (the lapse function) and its gradient (gravitational acceleration), with special emphasis given to curvature (the Kretschmann and Ricci-square scalars). These quantities are analyzed and their level surfaces plotted both above and below the black-hole horizons, in particular near the central singularities. Estimating that the black hole could be most strongly affected by the other black hole, we focus, in this first paper, on the Majumdar--Papapetrou solution for a binary black hole and compare the deformation caused by "the other" hole (and the electrostatic field) with that induced by rotational dragging in the well-known Kerr and Kerr--Newman solutions.

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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