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arXiv 1107.0694gr-qc
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一般Robinson-Trautman时空的数值演化:代码检验、波形和引力波提取效率

Numerical evolution of general Robinson-Trautman spacetimes: code tests, wave forms and the efficiency of the gravitational wave extraction

H. P. de Oliveira, E. L. Rodrigues, J. E. F. Skea

摘要:

我们提出了一个有效的数值代码的基础上的谱方法集成一般Robinson-Trautmann时空的场方程。度量函数的谱展开的最自然的基函数是球谐函数。使用适当组合的度量函数的值在配置点,我们已经设法减少表达膨胀时,球谐函数的数量增加。我们的数值代码运行的计算资源相对较少,代码测试显示出良好的精度和收敛性。该代码已被应用到物理利益的情况下,如:扰动的外部引力场的球体的物质;扰动的初始提升黑洞;和非正面碰撞的两个史瓦西黑洞的Robsinson-Trautmann几何。在处理这些过程中,我们推导出分析的下限和上限的速度所产生的黑洞和引力波提取的效率,分别。进行了数值实验,以确定引力波的形式和效率在每种情况下的利益。

英文摘要:

We present an efficient numerical code based on spectral methods to integrate the field equations of general Robinson-Trautmann spacetimes. The most natural basis functions for the spectral expansion of the metric functions are spherical harmonics. Using the values of appropriate combinations of the metric functions at the collocation points, we have managed to reduce expression swell when the number of spherical harmonics increases. Our numerical code runs with relatively little computational resources and the code tests have shown excellent accuracy and convergence. The code has been applied to situations of physical interest in the context of Robsinson-Trautmann geometries such as: perturbation of the exterior gravitational field of a spheroid of matter; perturbation of an initially boosted black hole; and the non-frontal collision of two Schwarzschild black holes. In dealing with these processes we have derived analytical lower and upper bounds on the velocity of the resulting black hole and the efficiency of the gravitational wave extraction, respectively. Numerical experiments were performed to determine the forms of the gravitational waves and the efficiency in each situation of interest.

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