关于LIGO - Virgo网络中的相关噪声：对随机引力波背景假设的检验
On correlated noise in the LIGO-Virgo network: a test of the stochastic gravitational-wave background hypothesis
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中文总结 AI 辅助
研究通过扩展分析LIGO - Virgo候选事件，用互相关函数对比事件与非源窗口，发现多数事件峰值与噪声无显著差异，互相关统计无法可靠分离事件和噪声，且应变数据或含连续相关物理成分，随机引力波背景是候选者。
中文摘要 AI 辅助
我们通过将Creswell等人（2017年）的分析扩展到O2和O3观测运行中的9个LIGO - Virgo候选事件，重新审视了引力波验证中使用的探测器间互相关标准。对于每个事件，我们分析所有三个探测器对（H1×L1、H1×V1、L1×V1），并使用仅带通的管道，将事件窗口中的归一化互相关函数C(τ)与N = 200个周围非源窗口的经验集合进行比较。在27对测量中的26对中，事件峰值在统计上与相应的噪声集合无法区分，唯一例外是H1×L1对中的GW190412。我们得出结论，互相关统计不能在事件和噪声之间提供可靠的独立分离。我们将LIGO - Virgo对中可比相关结构的持续存在解释为应变数据可能包含连续相关物理成分的证据，随机引力波背景是一个合理的候选者。
英文摘要
We revisit the inter-detector cross-correlation criterion used in gravitational-wave validation by extending the analysis of Creswell et al.~\cite{Creswell2017} to nine LIGO--Virgo candidate events from the O2 and O3 observing runs. For each event, we analyze all three detector pairs (H1$\times$L1, H1$\times$V1, L1$\times$V1) and compare the normalized cross-correlation function $C(τ)$ in the event window with an empirical ensemble of $N=200$ surrounding off-source windows, using a band-pass-only pipeline. In 26 of 27 pair-measurements, the event peak is statistically indistinguishable from the corresponding noise ensemble, including all pairs involving the independent Virgo detector. The only exception is GW190412 in the H1$\times$L1 pair. We conclude that the cross-correlation statistic does not provide a robust standalone separation between event and noise. We interpret the persistence of comparable correlation structure in the LIGO--Virgo pairs as evidence that the strain data may contain a continuous correlated physical component, for which a stochastic gravitational-wave background is a plausible candidate.
