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arXiv 1606.02532gr-qc
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数值相对论中引力波的提取

Extraction of Gravitational Waves in Numerical Relativity

Nigel T. Bishop, Luciano Rezzolla

摘要:

数值相对论的计算一般产生爱因斯坦方程的解,其中也包括辐射部分,这在实践中是在有限范围内计算的。由于引力辐射只有在零无穷远处和适当的坐标系中才能被正确定义,因此对所发射的引力波的精确估计是数值相对论中一个古老而重要的问题。多年来,已经开发了许多方法来从数值模拟中“提取”解决方案的辐射部分,这些方法包括:四极公式,规范不变的度量扰动,Weyl标量和特征提取。我们审查和讨论每种方法,在其理论背景以及其实施。最后,我们提供了一个简短的比较各种方法在其固有的优点和缺点。

英文摘要:

A numerical-relativity calculation yields in general a solution of the Einstein equations including also a radiative part, which is in practice computed in a region of finite extent. Since gravitational radiation is properly defined only at null infinity and in an appropriate coordinate system, the accurate estimation of the emitted gravitational waves represents an old and non-trivial problem in numerical relativity. A number of methods have been developed over the years to "extract" the radiative part of the solution from a numerical simulation and these include: quadrupole formulas, gauge-invariant metric perturbations, Weyl scalars, and characteristic extraction. We review and discuss each method, in terms of both its theoretical background as well as its implementation. Finally, we provide a brief comparison of the various methods in terms of their inherent advantages and disadvantages.

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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