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arXiv 1410.7698gr-qc
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Kerr几何的引力微扰:高精度研究

Gravitational perturbations of the Kerr geometry: High-accuracy study

Gregory B. Cook, Maxim Zalutskiy

摘要:

我们提出的结果从一个新的代码计算引力扰动的克尔几何。这个新的代码小心地保持高精度,使我们能够获得高精度的克尔时空的引力准正规模式的解决方案。这个新的代码的一部分是一个实施的频谱方法来解决角Teukolsky方程,据我们所知,还没有被用于确定准正规模式。我们把注意力集中在两个主要领域。首先,我们探讨了这些准正规模式的行为在极端极限的克尔,其中某些模式的频率接近积累点的实轴。我们比较我们的结果与最近的分析预测的行为,这些模式附近的积累点,发现很好的协议。第二,我们探讨的模式,在史瓦西极限的特殊频率$Mω=-2i$的解决方案的行为。我们的高精度方法使我们能够比以前的数值研究更接近史瓦西极限。与以前的工作不同,我们发现这个特殊的频率附近的行为与分析预测非常一致。我们包括我们的方法的详细描述,并利用融合Heun微分方程的理论。特别是,我们利用合流Heun多项式,以帮助阐明一些争议的存在,或不,在某些特殊的频率在史瓦西极限的准正常和总传输模式。

英文摘要:

We present results from a new code for computing gravitational perturbations of the Kerr geometry. This new code carefully maintains high precision to allow us to obtain high-accuracy solutions for the gravitational quasinormal modes of the Kerr space-time. Part of this new code is an implementation of a spectral method for solving the angular Teukolsky equation that, to our knowledge, has not been used before for determining quasinormal modes. We focus our attention on two main areas. First, we explore the behavior of these quasinormal modes in the extreme limit of Kerr, where the frequency of certain modes approaches accumulation points on the real axis. We compare our results with recent analytic predictions of the behavior of these modes near the accumulation points and find good agreement. Second, we explore the behavior of solutions of modes that approach the special frequency $Mω=-2i$ in the Schwarzschild limit. Our high-accuracy methods allow us to more closely approach the Schwarzschild limit than was possible with previous numerical studies. Unlike previous work, we find excellent agreement with analytic predictions of the behavior near this special frequency. We include a detailed description of our methods, and make use of the theory of confluent Heun differential equations throughout. In particular, we make use of confluent Heun polynomials to help shed some light on the controversy of the existence, or not, of quasinormal and total-transmission modes at certain special frequencies in the Schwarzschild limit.

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