Search for the Gravitational-wave Background from Cosmic Strings with the Parkes Pulsar Timing Array Second Data Release

被引：45
|
作者：
Chen, Zu-Cheng [1 ,2 ]
Wu, Yu-Mei [3 ,4 ,5 ]
Huang, Qing-Guo [3 ,4 ,5 ]
机构：
[1] Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
[2] Beijing Normal Univ, Adv Inst Nat Sci, Zhuhai 519087, Peoples R China
[3] Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China
[4] Univ Chinese Acad Sci, Sch Phys Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
[5] UCAS, Hangzhou Inst Adv Study, Sch Fundamental Phys & Math Sci, Hangzhou 310024, Peoples R China
来源：
ASTROPHYSICAL JOURNAL | 2022年 / 936卷 / 01期
关键词：
HOLE BINARY-SYSTEMS; SPIN NOISE; MODEL; RADIATION; LIMITS; PACKAGE; TEMPO2;
D O I：
10.3847/1538-4357/ac86cb
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We perform a direct search for an isotropic stochastic gravitational-wave background (SGWB) produced by cosmic strings in the Parkes Pulsar Timing Array (PPTA) Data Release 2 (DR2). We find no evidence for such an SGWB, and therefore place a 95% confidence level upper limit on the cosmic string tension, G mu, as a function of the reconnection probability, p, which can be less than 1 in the string-theory-inspired models or pure Yang-Mills theory. The upper bound on the cosmic string tension is G mu less than or similar to 5.1 x 10(-10) for p = 1, which is about five orders of magnitude tighter than the bound derived from the null search of individual gravitational-wave bursts from cosmic string cusps in the PPTA DR2, and comparable to previous bounds derived from the null search of the SGWB from cosmic strings.
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页数：4
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