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arXiv 1407.7656gr-qc
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Bowen-York初始数据中自旋黑洞的潮汐形变

Tidal deformations of spinning black holes in Bowen-York initial data

Miriam Cabero, Badri Krishnan

摘要:

本文研究了Bowen-York初始数据中双星伴星对旋转黑洞视界形状的潮汐形变。我们使用准局域视界的框架,并确定一个黑洞的边缘外捕获表面。内禀视界几何分别由一组质量和角动量多极矩$\mathcal{M}_n$和$\mathcal{J}_n$指定。潮汐形变由外部扰动引起的多极矩的变化来描述。这使我们定义了两组无量纲数,即$\mathcal{M}_n$和$\mathcal{J}_n$的潮汐系数,它们指定了具有双星伴星的黑洞的变形。我们计算这些潮汐系数在一个特定的模型问题,即鲍文约克初始数据集的二进制黑洞。我们只限于轴对称和小自旋的情形。在这种近似下,我们分析计算的共形因子,边缘捕获表面的位置,最后的多极矩和潮汐系数。

英文摘要:

We study the tidal deformations of the shape of a spinning black hole horizon due to a binary companion in the Bowen-York initial data set. We use the framework of quasi-local horizons and identify a black hole by marginally outer trapped surfaces. The intrinsic horizon geometry is specified by a set of mass and angular-momentum multipole moments $\mathcal{M}_n$ and $\mathcal{J}_n$ respectively. The tidal deformations are described by the change in these multipole moments caused by an external perturbation. This leads us to define two sets of dimensionless numbers, the tidal coefficients for $\mathcal{M}_n$ and $\mathcal{J}_n$, which specify the deformations of a black hole with a binary companion. We compute these tidal coefficients in a specific model problem, namely the Bowen-York initial data set for binary black holes. We restrict ourselves to axisymmetric situations and to small spins. Within this approximation, we analytically compute the conformal factor, the location of the marginally trapped surfaces, and finally the multipole moments and the tidal coefficients.

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