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arXiv 1004.1353gr-qc
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精确初值下多个黑洞的数值演化

Numerical evolution of multiple black holes with accurate initial data

Pablo Galaviz, Bernd Bruegmann, Zhoujian Cao

摘要:

我们提出了三个等质量黑洞的数值演化使用移动穿刺方法。利用高阶多重网格椭圆型求解器求解约束方程,计算了三个黑洞的穿刺初始数据。利用这些初始数据,我们给出了三个具有六阶波形收敛的黑洞演化的结果。我们比较了BAM和AMSS-NCKU码与以前的结果。在以前的模拟中使用的三个黑洞的哈密顿约束的近似解析解导致不同的动力学和波形。我们提出了一些数值实验,显示四个黑洞的演化和由此产生的引力波形。

英文摘要:

We present numerical evolutions of three equal-mass black holes using the moving puncture approach. We calculate puncture initial data for three black holes solving the constraint equations by means of a high-order multigrid elliptic solver. Using these initial data, we show the results for three black hole evolutions with sixth-order waveform convergence. We compare results obtained with the BAM and AMSS-NCKU codes with previous results. The approximate analytic solution to the Hamiltonian constraint used in previous simulations of three black holes leads to different dynamics and waveforms. We present some numerical experiments showing the evolution of four black holes and the resulting gravitational waveform.

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