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arXiv 2101.09615gr-qc
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双黑洞并合中的曲率不变量和几何视界猜想

Curvature Invariants and the Geometric Horizon Conjecture in a Binary Black Hole Merger

Jeremy M. Peters, Alan Coley, Erik Schnetter

摘要:

研究了双黑洞合并中的曲率不变量。本文证明,通过寻找黎曼张量的适当曲率不变量的水平$0$集,可以定义一个准定域的与叶理无关的黑洞视界。这个猜想是几何视界猜想,而相应的视界是几何视界。我们研究这个猜想通过跟踪的水平- $0$集的复标量多项式不变量,$\mathcal{D}$,通过一个准圆形的二元黑洞合并。对于小的$\varepsilon$,我们用$|\mathcal{D}|$的水平- $\varepsilon$集来近似$\mathcal{D}$的这些水平-$0$集。我们定位了$|\mathcal{D}|$的局部极小点,发现这些局部极小点的位置与$|\mathcal{D}|$的水平$\varepsilon$集密切对应,并与$\text{Re}(\mathcal{D})$的水平$0$集进行了比较.分析提供的证据表明,水平- $\varepsilon$集跟踪一个独特的几何地平线。通过研究$\text{Re}(\mathcal{D})$和$\text{Im}(\mathcal{D})$的零点集的行为,以及初始黑洞的MOTS和视视界,我们观察到最接近几何视界的水平$\varepsilon$集由$\varepsilon = 10^{-3}$给出.

英文摘要:

We study curvature invariants in a binary black hole merger. It has been conjectured that one could define a quasi-local and foliation independent black hole horizon by finding the level--$0$ set of a suitable curvature invariant of the Riemann tensor. The conjecture is the geometric horizon conjecture and the associated horizon is the geometric horizon. We study this conjecture by tracing the level--$0$ set of the complex scalar polynomial invariant, $\mathcal{D}$, through a quasi-circular binary black hole merger. We approximate these level--$0$ sets of $\mathcal{D}$ with level--$\varepsilon$ sets of $|\mathcal{D}|$ for small $\varepsilon$. We locate the local minima of $|\mathcal{D}|$ and find that the positions of these local minima correspond closely to the level--$\varepsilon$ sets of $|\mathcal{D}|$ and we also compare with the level--$0$ sets of $\text{Re}(\mathcal{D})$. The analysis provides evidence that the level--$\varepsilon$ sets track a unique geometric horizon. By studying the behaviour of the zero sets of $\text{Re}(\mathcal{D})$ and $\text{Im}(\mathcal{D})$ and also by studying the MOTSs and apparent horizons of the initial black holes, we observe that the level--$\varepsilon$ set that best approximates the geometric horizon is given by $\varepsilon = 10^{-3}$.

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