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arXiv 0708.0450gr-qcastro-ph
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Schwarzschild黑洞的二阶准正规模

Second Order Quasi-Normal Mode of the Schwarzschild Black Hole

Hiroyuki Nakano, Kunihito Ioka

摘要:

我们用公式表示并计算了Schwarzschild黑洞的二阶准正规模。在广义相对论中,人们通常将畸变黑洞产生的引力波称为衰荡现象。由于GW探测器能够以高的信噪比探测到来自BH并合的QNM,因此也有可能探测到由BH附近的非线性引力相互作用产生的二阶微扰QNM。在BH微扰方法中,我们推导出主Zerilli方程的度量微扰到二阶,并明确正则化它在地平线和空间无穷远。我们数值求解二阶Zerilli方程的实施修改的Leaver的连分式方法。发现二阶QNM频率是一阶QNM频率的2倍,GW振幅达到一阶QNM频率的$\sim 10%$。由于二阶QNM总是存在的,我们可以使用它们的检测(i)测试广义相对论的非线性,特别是无毛定理,(ii)在QNM GW的数据分析中去除假事件,以及(iii)测量到BH的距离。

英文摘要:

We formulate and calculate the second order quasi-normal modes (QNMs) of a Schwarzschild black hole (BH). Gravitational wave (GW) from a distorted BH, so called ringdown, is well understood as QNMs in general relativity. Since QNMs from binary BH mergers will be detected with high signal-to-noise ratio by GW detectors, it is also possible to detect the second perturbative order of QNMs, generated by nonlinear gravitational interaction near the BH. In the BH perturbation approach, we derive the master Zerilli equation for the metric perturbation to second order and explicitly regularize it at the horizon and spatial infinity. We numerically solve the second order Zerilli equation by implementing the modified Leaver's continued fraction method. The second order QNM frequencies are found to be twice the first order ones, and the GW amplitude is up to $\sim 10%$ that of the first order for the binary BH mergers. Since the second order QNMs always exist, we can use their detections (i) to test the nonlinearity of general relativity, in particular the no-hair theorem, (ii) to remove fake events in the data analysis of QNM GWs and (iii) to measure the distance to the BH.

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