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arXiv 1407.6983gr-qcastro-ph.HE
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旋转黑洞的强场潮汐畸变:圆形赤道轨道的形式和结果

Strong-field tidal distortions of rotating black holes: Formalism and results for circular, equatorial orbits

Stephen O'Sullivan, Scott A. Hughes

摘要:

紧密双星系统中成员之间的潮汐耦合对双星的动力学内旋有着有趣而重要的影响。潮汐耦合也扭曲了双星的成员,将它们(在最低阶)从球体变成椭球体。至少在流体和牛顿引力的限制下,在变形椭球的几何形状和潮汐对轨道演化的影响之间存在简单的联系。在本文中,我们开发的工具,调查潮汐扭曲的快速旋转的黑洞使用的技术是好的强场,快速运动的双轨道。我们使用黑洞微扰理论,所以我们的结果假设极端的质量比。我们开发的工具来计算失真的黑洞的曲率为任何自旋参数,并从任何绑定轨道所产生的潮汐场,在频域中。我们还开发了工具来可视化黑洞自旋$a/M \le \sqrt{3}/2$的视界的扭曲(留下更复杂的$a/M > \sqrt{3}/2$的情况下,未来的分析)。然后,我们研究如何克尔黑洞的事件视界是扭曲的一个小机构在一个圆形,赤道轨道。我们发现,潮汐畸变的几何形状和轨道的演变之间的联系并不像在牛顿极限下那么简单。

英文摘要:

Tidal coupling between members of a compact binary system can have an interesting and important influence on that binary's dynamical inspiral. Tidal coupling also distorts the binary's members, changing them (at lowest order) from spheres to ellipsoids. At least in the limit of fluid bodies and Newtonian gravity, there are simple connections between the geometry of the distorted ellipsoid and the impact of tides on the orbit's evolution. In this paper, we develop tools for investigating tidal distortions of rapidly rotating black holes using techniques that are good for strong-field, fast-motion binary orbits. We use black hole perturbation theory, so our results assume extreme mass ratios. We develop tools to compute the distortion to a black hole's curvature for any spin parameter, and for tidal fields arising from any bound orbit, in the frequency domain. We also develop tools to visualize the horizon's distortion for black hole spin $a/M \le \sqrt{3}/2$ (leaving the more complicated $a/M > \sqrt{3}/2$ case to a future analysis). We then study how a Kerr black hole's event horizon is distorted by a small body in a circular, equatorial orbit. We find that the connection between the geometry of tidal distortion and the orbit's evolution is not as simple as in the Newtonian limit.

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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