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arXiv 1111.2177gr-qc
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广义相对论的Z4c公式的数值稳定性

Numerical stability of the Z4c formulation of general relativity

Zhoujian Cao, David Hilditch

摘要:

本文研究了广义相对论Z4公式的共形分解离散化的不同方法的数值稳定性。我们证明,在线性,常系数制度的一种新的离散张量是正式的数值稳定的线时间积分的方法。然后,我们进行了一套完整的苹果与苹果测试的非线性系统,从而提出了数值证据表明,无论是新的和标准的离散化,在某种意义上说,数值稳定的非线性制度。Z4c数值试验的结果与BSSNOK演化的结果进行了比较。我们通常不采用Z4c约束阻尼方案,并发现在鲁棒稳定性和规范波测试中,Z4c演化导致与BSSNOK演化相同分辨率的较低约束违反。在规范波测试中,我们发现Z4c演化比BSSNOK测试在更多的光交叉时间上保持所需的收敛因子。其余测试的差异是微不足道的。

英文摘要:

We study numerical stability of different approaches to the discretization of a conformal decomposition of the Z4 formulation of general relativity. We demonstrate that in the linear, constant coefficient regime a novel discretization for tensors is formally numerically stable with a method of lines time-integrator. We then perform a full set of apples with apples tests on the non-linear system, and thus present numerical evidence that both the new and standard discretizations are, in some sense, numerically stable in the non-linear regime. The results of the Z4c numerical tests are compared with those of BSSNOK evolutions. We typically do not employ the Z4c constraint damping scheme and find that in the robust stability and gauge wave tests the Z4c evolutions result in lower constraint violation at the same resolution as the BSSNOK evolutions. In the gauge wave tests we find that the Z4c evolutions maintain the desired convergence factor over many more light-crossing times than the BSSNOK tests. The difference in the remaining tests is marginal.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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