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arXiv 2201.13335gr-qcastro-ph.HE
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精确计算黑洞周围自旋体的束缚轨道II:一般轨道

Precisely computing bound orbits of spinning bodies around black holes II: Generic orbits

Lisa V. Drummond, Scott A. Hughes

摘要:

在本文中,我们继续研究自旋测试体绕克尔黑洞的运动。非旋转的测试物体遵循它们在其中运动的时空的测地线。一个测试物体的自旋耦合到该时空的曲率,引入一个“自旋曲率力”,将物体的世界线推离测地线轨道。自旋曲率力是后测地线效应的一个重要例子,必须仔细建模,以准确描述绕黑洞运行的物体的运动。这项工作的动机之一是了解如何将这种效应纳入恒星质量体螺旋进入大质量黑洞产生的引力波模型中。在本文的前身,我们描述了一种技术,用于计算绑定轨道的旋转机构周围的黑洞的频域描述,可以非常精确地解决。在这篇论文中,我们提出了我们的方法的概述,以及目前的结果,轨道是偏心和近赤道(即,轨道的运动不超过偏离赤道平面的$\mathcal{O}(S)$)。在本文中,我们将这一提法完全通用的情况下-轨道是倾斜和偏心的,与小机构的自旋任意取向。我们计算这些轨道遵循的轨迹,并计算小天体的自旋如何影响重要的量,如可观测的轨道频率$Ω_r$,$Ω_θ$和$Ω_ϕ$。

英文摘要:

In this paper, we continue our study of the motion of spinning test bodies orbiting Kerr black holes. Non-spinning test bodies follow geodesics of the spacetime in which they move. A test body's spin couples to the curvature of that spacetime, introducing a "spin-curvature force" which pushes the body's worldline away from a geodesic trajectory. The spin-curvature force is an important example of a post-geodesic effect which must be modeled carefully in order to accurately characterize the motion of bodies orbiting black holes. One motivation for this work is to understand how to include such effects in models of gravitational waves produced from the inspiral of stellar mass bodies into massive black holes. In this paper's predecessor, we describe a technique for computing bound orbits of spinning bodies around black holes with a frequency-domain description which can be solved very precisely. In that paper, we present an overview of our methods, as well as present results for orbits which are eccentric and nearly equatorial (i.e., the orbit's motion is no more than $\mathcal{O}(S)$ out of the equatorial plane). In this paper, we apply this formulation to the fully generic case -- orbits which are inclined and eccentric, with the small body's spin arbitrarily oriented. We compute the trajectories which such orbits follow, and compute how the small body's spin affects important quantities such as the observable orbital frequencies $Ω_r$, $Ω_θ$ and $Ω_ϕ$.

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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