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arXiv 1511.02479gr-qc
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柱面引力波的非线性演化:数值方法和物理问题

Nonlinear evolution of cylindrical gravitational waves: numerical method and physical aspects

Juliana Celestino, H. P. de Oliveira, E. L. Rodrigues

摘要:

一般的柱面波是最简单的轴对称引力波,它包含$+$和$\times$两种偏振模式。本文采用基于Galerkin配点法的数值程序,在特征格式下研究了一般柱面引力波的演化。调查包括数值实现的概念,如邦迪质量和新闻功能,以适应圆柱对称。由于与两种偏振模式相关的新闻函数的存在,邦迪质量衰减。我们已经解释了每个偏振模式作为通道,从其中提取质量。在此基础上,我们提出了偏振模$+$由于与偏振模$\times$的非线性相互作用而产生的增强效应。在讨论了圆柱对称中物质的作用之后,我们将数值代码扩展到包括电磁场。

英文摘要:

General cylindrical waves are the simplest axisymmetrical gravitational waves that contain both $+$ and $\times$ modes of polarization. In this paper, we have studied the evolution of general cylindrical gravitational waves in the realm of the characteristic scheme with a numerical code based on the Galerkin-Collocation method. The investigation consists of the numerical realization of concepts such as Bondi mass and the news functions adapted to cylindrical symmetry. The Bondi mass decays due to the presence of the news functions associated with both polarization modes. We have interpreted that each polarization mode as channels from which mass is extracted. Under this perspective, we have presented the enhancement effect of the polarization mode $+$ due to the nonlinear interaction with the mode $\times$. After discussing the role of matter in cylindrical symmetry, we have extended the numerical code to include electromagnetic fields.

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