Searching for gravitational-wave bursts from cosmic string cusps with the Parkes Pulsar Timing Array
Searching for gravitational-wave bursts from cosmic string cusps with the Parkes Pulsar Timing Array
复制标题
DOI：
10.1093/mnras/staa3721
复制
发表时间：
2020-11
影响因子：
4.8
通讯作者：
Naoyuki Yonemaru;Naoyuki Yonemaru;S. Kuroyanagi;S. Kuroyanagi;G. Hobbs;Kazuma Takahashi;Xingjiang Zhu;Xingjiang Zhu;W. Coles;Shi Dai;E. Howard;E. Howard;E. Howard;R. Manchester;D. Reardon;D. Reardon;C. Russell;R. Shannon;R. Shannon;N. Thyagarajan;R. Spiewak;R. Spiewak;J.-B. Wang
中科院分区：
文献类型：
--
作者：
Naoyuki Yonemaru;Naoyuki Yonemaru;S. Kuroyanagi;S. Kuroyanagi;G. Hobbs;Kazuma Takahashi;Xingjiang Zhu;Xingjiang Zhu;W. Coles;Shi Dai;E. Howard;E. Howard;E. Howard;R. Manchester;D. Reardon;D. Reardon;C. Russell;R. Shannon;R. Shannon;N. Thyagarajan;R. Spiewak;R. Spiewak;J.-B. Wang
宇宙弦是一种潜在的引力波源，可以用脉冲星定时阵列（PTA）探测。在这项工作中，我们开发了一个检测算法的GW爆发从一个尖点上的宇宙弦，并将其应用到帕克斯PTA数据。我们发现四个事件的虚警概率小于1%。然而，进一步的调查表明，所有这些都可能是虚假的。由于没有令人信服的检测，我们对不同事件持续时间的GW振幅设置上限。从这些界限中，我们对宇宙弦张力Gμ π ι 10−5进行了限制，并强调这个界限与使用其他技术获得的界限无关。最后讨论了这些结果的物理意义以及在平方公里阵时代探测宇宙弦的前景。
Cosmic strings are potential gravitational-wave (GW) sources that can be probed by pulsar timing arrays (PTAs). In this work we develop a detection algorithm for a GW burst from a cusp on a cosmic string, and apply it to Parkes PTA data. We find four events with a false alarm probability less than 1 per cent. However further investigation shows that all of these are likely to be spurious. As there are no convincing detections we place upper limits on the GW amplitude for different event durations. From these bounds we place limits on the cosmic string tension of Gμ ∼ 10−5, and highlight that this bound is independent from those obtained using other techniques. We discuss the physical implications of our results and the prospect of probing cosmic strings in the era of Square Kilometre Array.