Identifying noise transients in gravitational-wave data arising from nonlinear couplings

IF 3.6 3区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Classical and Quantum Gravity Pub Date : 2024-11-21 DOI:10.1088/1361-6382/ad7cb7
Bernard Hall, Sudhagar Suyamprakasam, Nairwita Mazumder, Anupreeta More and Sukanta Bose
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Abstract

Noise in various interferometer systems can sometimes couple non-linearly to create excess noise in the gravitational wave (GW) strain data. Third-order statistics, such as bicoherence and biphase, can identify these couplings and help discriminate those occurrences from astrophysical GW signals. However, the conventional analysis can yield large bicoherence values even when no phase-coupling is present, thereby, resulting in false identifications. Introducing artificial phase randomization in computing the bicoherence reduces such occurrences with negligible impact on its effectiveness for detecting true phase-coupled disturbances. We demonstrate this property with simulated disturbances—focusing only on short-duration ones (lasting up to a few seconds) and employing mainly the auto-bicoherence in this work. Statistical hypothesis testing is used for distinguishing phase-coupled disturbances from non-phase coupled ones when employing the phase-randomized bicoherence. We also obtain an expression for the bicoherence value that minimizes the sum of the probabilities of false positives and false negatives. This can be chosen as a threshold for shortlisting bicoherence triggers for further scrutiny for the presence of non-linear coupling. Finally, the utility of the phase-randomized bicoherence analysis in GW time-series data is demonstrated for the following three scenarios: (1) Finding third-order statistical similarities within categories of noise transients, such as blips and koi fish. If these non-Gaussian noise transients, or glitches, have a common source, their bicoherence maps can have similarities arising from common bifrequencies related to that source. (2) Differentiating linear or non-linear phase-coupled glitches from compact binary coalescence signals through their bicoherence maps. This is explained with a simulated signal. (3) Identifying repeated bifrequencies in the second and third observation runs (i.e. O2 and O3) of LIGO and Virgo.
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识别引力波数据中由非线性耦合引起的瞬时噪声
各种干涉仪系统中的噪声有时会发生非线性耦合,从而在引力波(GW)应变数据中产生过量噪声。三阶统计,如双相干和双相,可以识别这些耦合,并帮助将这些现象与天体物理引力波信号区分开来。然而,传统的分析方法即使在不存在相位耦合的情况下也会产生较大的双相干值,从而导致错误的识别。在计算双相干时引入人工相位随机化,可以减少这种情况的发生,而对其检测真正相位耦合干扰的有效性的影响可以忽略不计。我们通过模拟干扰来证明这一特性--在这项工作中,我们只关注短时干扰(最多持续几秒钟),并主要采用自动比对相干。在使用相位随机双相干时,我们使用统计假设检验来区分相位耦合干扰和非相位耦合干扰。我们还获得了一个使假阳性和假阴性概率之和最小化的双相干值表达式。我们可以将此值作为一个阈值,用于筛选双相干触发器,以进一步检查是否存在非线性耦合。最后,在以下三种情况下,展示了相随机双相干分析在 GW 时间序列数据中的实用性:(1) 在各类噪声瞬态(如突波和锦鲤)中寻找三阶统计相似性。如果这些非高斯噪声瞬态或突波有一个共同的来源,它们的双相干图就会因与该来源相关的共同双频率而具有相似性。(2) 通过双相干图从紧凑的二进制凝聚信号中区分线性或非线性相位耦合突波。通过模拟信号对此进行解释。(3) 在 LIGO 和室女座的第二和第三次观测运行(即 O2 和 O3)中识别重复的双频。
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来源期刊
Classical and Quantum Gravity
Classical and Quantum Gravity 物理-天文与天体物理
CiteScore
7.00
自引率
8.60%
发文量
301
审稿时长
2-4 weeks
期刊介绍: Classical and Quantum Gravity is an established journal for physicists, mathematicians and cosmologists in the fields of gravitation and the theory of spacetime. The journal is now the acknowledged world leader in classical relativity and all areas of quantum gravity.
期刊最新文献
Identifying noise transients in gravitational-wave data arising from nonlinear couplings The Penrose limit of the Weyl double copy Correlations and signaling in the Schrödinger–Newton model A rapid multi-modal parameter estimation technique for LISA Existence and absence of Killing horizons in static solutions with symmetries
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