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arXiv 1208.3891gr-qc
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高阶格式下的广义相对论零锥演化

General relativistic null-cone evolutions with a high-order scheme

Christian Reisswig, Nigel T. Bishop, Denis Pollney

摘要:

利用Bondi和Sachs建立的框架,提出了一个求解特征零超曲面上全非线性爱因斯坦方程的高阶格式。这种形式主义允许渐近平坦的空间被表示在有限的紧致网格上,因此对于引力辐射的远场研究是理想的。我们设计了一种基于四阶径向积分和有限差分的算法,以及角分量的谱表示。该方案可以提供显着更高的精度与相对较低的计算成本相比,以前的方法作为高阶离散化的结果。基于一个新实现的代码,我们表明,新的数值方案保持稳定,并收敛在预期的精度顺序。

英文摘要:

We present a high-order scheme for solving the full non-linear Einstein equations on characteristic null hypersurfaces using the framework established by Bondi and Sachs. This formalism allows asymptotically flat spaces to be represented on a finite, compactified grid, and is thus ideal for far-field studies of gravitational radiation. We have designed an algorithm based on 4th-order radial integration and finite differencing, and a spectral representation of angular components. The scheme can offer significantly more accuracy with relatively low computational cost compared to previous methods as a result of the higher-order discretization. Based on a newly implemented code, we show that the new numerical scheme remains stable and is convergent at the expected order of accuracy.

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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