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arXiv 1507.00570gr-qc
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用修正的Baumgarte-Shapiro-Shibata-Nakamura公式改进快速旋转黑洞演化模拟

Improved fast-rotating black hole evolution simulations with modified Baumgarte-Shapiro-Shibata-Nakamura formulation

Hwei-Jang Yo, Zhoujian Cao, Chun-Yu Lin, Hsing-Po Pan

摘要:

数值相对论中爱因斯坦方程的不同表述不仅会影响数值模拟的稳定性,而且会影响数值模拟的精度。在最初的Baumgarte-Shapiro-Shibata-Nakamura(BSSN)公式中,角动量的损失$J$在高速旋转的单个黑洞演化中是不可忽略的.这种损失也会出现,通常是在合并之后,在高自旋的双黑洞模拟中,$J$的损失可能归因于一些不清楚的数值耗散。减少非物理耗散预计将导致更稳定和准确的演变。在以前的工作\cite{yhlc12}中,我们提出了几个修改,能够防止黑洞演化的非物理耗散,并由此产生的模拟比传统的BSSN制定更稳定。具体而言,这三种修饰(M1、M2和M3)增强了制剂的稳定性、双曲性和耗散效应。我们在这项工作中进一步实验与这些修改,并证明这些修改提高了精度,也有效地抑制$J$的损失,特别是在黑洞模拟与初始大比例的$J$和ADM质量的平方。

英文摘要:

Different formulations of Einstein's equations used in numerical relativity can affect not only the stability but also the accuracy of numerical simulations. In the original Baumgarte-Shapiro-Shibata-Nakamura (BSSN) formulation, the loss of the angular momentum, $J$, is non-negligible in highly spinning single black hole evolutions. This loss also appears, usually right after the merger, in highly spinning binary black hole simulations, The loss of $J$ may be attributed to some unclear numerical dissipation. Reducing unphysical dissipation is expected to result in more stable and accurate evolutions. In the previous work \cite{yhlc12} we proposed several modifications which are able to prevent black hole evolutions from the unphysical dissipation, and the resulting simulations are more stable than in the traditional BSSN formulation. Specifically, these three modifications (M1, M2, and M3) enhance the effects of stability, hyperbolicity, and dissipation of the formulation. We experiment further in this work with these modifications, and demonstrate that these modifications improve the accuracy and also effectively suppress the loss of $J$, particularly in the black hole simulations with the initially large ratio of $J$ and the square of the ADM mass.

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