Searching for isotropic stochastic gravitational-wave background in the international pulsar timing array second data release

被引：37
|
作者：
Chen, Zu-Cheng [1 ,2 ,3 ,4 ]
Wu, Yu-Mei [1 ,2 ]
Huang, Qing-Guo [1 ,2 ,5 ]
机构：
[1] Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China
[2] Univ Chinese Acad Sci, Sch Phys Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
[3] Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
[4] Beijing Normal Univ, Adv Inst Nat Sci, Zhuhai 519087, Peoples R China
[5] UCAS, Hangzhou Inst Adv Study, Sch Fundamental Phys & Math Sci, Hangzhou 310024, Peoples R China
来源：
COMMUNICATIONS IN THEORETICAL PHYSICS | 2022年 / 74卷 / 10期
关键词：
stochastic gravitational-wave background; pulsar timing array; beyond general relativity; HOLE BINARY-SYSTEMS; RADIATION; PACKAGE; TEMPO2; LIMITS; PROBE;
D O I：
10.1088/1572-9494/ac7cdf
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We search for isotropic stochastic gravitational-wave background (SGWB) in the International Pulsar Timing Array second data release. By modeling the SGWB as a power-law, we find very strong Bayesian evidence for a common-spectrum process, and further this process has scalar transverse (ST) correlations allowed in general metric theory of gravity as the Bayes factor in favor of the ST-correlated process versus the spatially uncorrelated common-spectrum process is 30 +/- 2. The median and the 90% equal-tail amplitudes of ST mode are A(ST) = 1.29(-0.44)(+0.51) x 10(-15), or equivalently the energy density parameter per logarithm frequency is Omega(ST)(GW) = 2.31(-1.30)(+2.19) x 10(-9), at frequency of 1 year(-1). However, we do not find any statistically significant evidence for the tensor transverse (TT) mode and then place the 95% upper limits as A(TT) < 3.95 x 10(-15), or equivalently Omega(TT)(GW) < 2.16 x 10(-9), at frequency of 1 year(-1).
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页数：6
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