Gravitational-wave background from kink-kink collisions on infinite cosmic strings
Gravitational-wave background from kink-kink collisions on infinite cosmic strings
复制标题
无限宇宙弦上扭结碰撞产生的引力波背景
DOI：
10.1103/physrevd.100.123515
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发表时间：
2019
影响因子：
5
通讯作者：
Kuroyanagi Sachiko
中科院分区：
文献类型：
--
作者：
Matsui Yuka;Kuroyanagi Sachiko
我们计算了无限宇宙弦上扭结碰撞产生的随机引力波（GW）背景的功率谱。宇宙弦网络中的交叉点不断产生扭结，这些扭结通过在弯曲弦上的传播以及它们的碰撞发出GW爆发。首先，我们发现，由于更高的事件速率，扭结碰撞产生的GW背景比高频传播扭结产生的要大得多。在此基础上，我们提出了一种既考虑GW辐射对弦网的能量损失，又考虑GW反反应导致的扭结数减少的方法。我们发现这些效应降低了高频率下GW背景的振幅，并产生了平坦的频谱。最后，我们利用先进LIGO在GW背景下的电流上界，利用脉冲星定时阵列，得到了弦张力的约束条件。
We calculate the power spectrum of the stochastic gravitational-wave (GW) background expected from kink-kink collisions on infinite cosmic strings. Intersections in the cosmic string network continuously generate kinks, which emit GW bursts by their propagation on curved strings as well as by their collisions. First, we show that the GW background from kink-kink collisions is much larger than the one from propagating kinks at high frequencies because of the higher event rate. We then propose a method to take into account the energy loss of the string network by GW emission as well as the decrease of the kink number due to the GW backreaction. We find that these effects reduce the amplitude of the GW background at high frequencies and produce a flat spectrum. Finally, we obtain a constraint on the string tension ofusing the current upper bound on the GW background by Advanced LIGO, andusing pulsar timing arrays.