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

By Zu-Cheng Chen, Yu-Mei Wu, Q. Huang. Communications in Theoretical Physics, 2021

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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 ST=1.29−0.44+0.51×10−15 , or equivalently the energy density parameter per logarithm frequency is ΩGWST=2.31−1.30+2.19×10−9 , 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 TT<3.95×10−15 , or equivalently ΩGWTT<2.16×10−9 , at frequency of 1 year−1.

Subfields: Astronomy and Astrophysics, Atomic and Molecular Physics, and Optics, Oceanography

View Paper: https://www.semanticscholar.org/paper/2b9b0907a0c5b9d93d2559ec5b37833ad8458284

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Citations in the corpus

Searching for the Nano-Hertz Stochastic Gravitational Wave Background with the Chinese Pulsar Timing Array Data Release I (2023, methodology): “Our GWB amplitude seems to be compatible with that of the common red signal of other PTAs (Arzoumanian et al. 2020; Chen et al. 2021; Goncharov et al. 2021; Antoniadis et al. 2022), although the median of posterior distribution seems to be 0.4–0.5 dex higher.”
Search for an Isotropic Gravitational-wave Background with the Parkes Pulsar Timing Array (2023, methodology): “Inference and PTA likelihood We use Bayesian inference1 to search for and characterize noise and signals in our data set, following previous PTA analyses (Arzoumanian et al. 2020; Goncharov et al. 2021a; Chen et al. 2021; Antoniadis et al. 2022).”
The NANOGrav 15 yr Data Set: Evidence for a Gravitational-wave Background (2023, methodology): “…independent analyses by the PPTA and EPTA collaborations reported results consistent with ours (Goncharov et al. 2021a; Chen et al. 2021), as did the search of a combined data set (Antoniadis et al. 2022)—a syzygy of tantalizing discoveries that portend the rise of low-frequency GW astronomy.”