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Search for the non-linearities of gravitational wave background in NANOGrav 15-year data set

Jun-Qian JiangYun-Song Piao
Jan 2024
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摘要原文
The recently reported signal of common red noise between pulsars by several pulsar timing array collaborations has been thought as evidence of the stochastic gravitational wave background (SGWB) due to the Helling-Downs correlation. In this study, we will search for the non-linearities of SGWB through its effect on the overlap reduction function in NANOGrav 15-year data set. In particular, we focus on a folded non-Gaussian component to SGWB whose amplitude is quantified with a single parameter $\alpha$ in the unpolarized case. The results reveal that such a non-Gaussianity of SGWB is favored, and $\alpha=0$ (the Gaussian SGWB) is excluded at about $3\sigma$ level.
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