Improved calculation of the gravitational wave spectrum from kinks on infinite cosmic strings
Improved calculation of the gravitational wave spectrum from kinks on infinite cosmic strings
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DOI：
10.1088/1475-7516/2016/11/005
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发表时间：
2016-05
影响因子：
6.4
通讯作者：
Yuka Matsui;Koichiro Horiguchi;Daisuke Nitta;S. Kuroyanagi
中科院分区：
文献类型：
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作者：
Yuka Matsui;Koichiro Horiguchi;Daisuke Nitta;S. Kuroyanagi
引力波观测为寻找宇宙弦提供了独特的机会。引力波的最强来源之一是宇宙弦的不连续，称为扭结，它在交叉点产生。众所周知，无限弦上的扭结会在很宽的频率范围内产生引力波背景。本文通过数值求解扭结锐度分布函数的演化方程，计算了引力波背景的谱。我们发现，小锐度的扭结数目比以前工作中使用的解析估计要多，这使得光谱形状有所不同。我们的数值方法使我们能够为未来的引力波实验对频谱幅度做出更精确的预测。
Gravitational wave observations provide unique opportunities to search for cosmic strings. One of the strongest sources of gravitational waves is discontinuities of cosmic strings, called kinks, which are generated at points of intersection. Kinks on infinite strings are known to generate a gravitational wave background over a wide range of frequencies. In this paper, we calculate the spectrum of the gravitational wave background by numerically solving the evolution equation for the distribution function of the kink sharpness. We find that the number of kinks for small sharpness is larger than the analytical estimate used in a previous work, which makes a difference in the spectral shape. Our numerical approach enables us to make a more precise prediction on the spectral amplitude for future gravitational wave experiments.