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arXiv 1012.2028gr-qc
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粒子径向落入史瓦西黑洞的引力辐射。谱、准简正模和幂律尾的数值研究

Gravitational radiation from radial infall of a particle into a Schwarzschild black hole. A numerical study of the spectra, quasi-normal modes and power-law tails

Ermis Mitsou

摘要:

计算一个粒子落入史瓦西黑洞时所发出的引力辐射,是20世纪70年代已经研究过的经典问题。在这里,我们提出了一个详细的数值分析的情况下,径向下降开始在无穷远,没有初始速度。我们计算的辐射波形,频谱和能量的多极l = 6,显着提高现有结果的数值精度。这是通过使用格林函数方法在频域中积分Zerilli方程来完成的。由此产生的波表现出“衰荡”阶段,其主要贡献是黑洞的准正常模式的叠加。数值精度使我们能够通过拟合波的那一部分来恢复这些模式的频率。与直接计算准简正模相比,对每个多极子的前两个泛频,我们达到了\sim 10^{-4}到\sim 10^{-2}的精度。我们的数值精度也使我们能够显示幂律尾波的发展后,衰荡已呈指数截止。这种贡献的振幅比波的典型尺度小\sim 10^2到\sim 10^3倍。

英文摘要:

The computation of the gravitational radiation emitted by a particle falling into a Schwarzschild black hole is a classic problem studied already in the 1970s. Here we present a detailed numerical analysis of the case of radial infall starting at infinity with no initial velocity. We compute the radiated waveforms, spectra and energies for multipoles up to l = 6, improving significantly on the numerical accuracy of existing results. This is done by integrating the Zerilli equation in the frequency domain using the Green's function method. The resulting wave exhibits a "ring-down" phase whose dominant contribution is a superposition of the quasi-normal modes of the black hole. The numerical accuracy allows us to recover the frequencies of these modes through a fit of that part of the wave. Comparing with direct computations of the quasi-normal modes we reach a \sim 10^{-4} to \sim 10^{-2} accuracy for the first two overtones of each multipole. Our numerical accuracy also allows us to display the power-law tail that the wave develops after the ring-down has been exponentially cut-off. The amplitude of this contribution is \sim 10^2 to \sim 10^3 times smaller than the typical scale of the wave.

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