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arXiv 1808.01532gr-qc
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连续引力波搜索中模板度规的相位分解

Phase decomposition of the template metric for continuous gravitational-wave searches

S. Mastrogiovanni, P. Astone, S. D Antonio, S. Frasca, G. Intini, I. La Rosa, P. Leaci, A. Miller, F. Muciaccia, C. Palomba, O. J. Piccinni, A. Singhal

摘要:

LIGO-Virgo探测器灵敏度波段中的一种引力波信号预计将由旋转的非对称中子星发射,其旋转频率可能在LIGO-Virgo探测器最灵敏的波段中发射连续的引力辐射。这类信号最重要的特征是它们的相位演化,这在长时间的观测运行中是稳定的。当使用基于匹配滤波的分析时,需要长相干信号的相位演化来定义如何构建适当的模板网格,以便获得尽可能好的信噪比。该信息被编码在称为\textit{phase metric}的矩阵中,该矩阵表征由匹配滤波给出的似然的几何形状。在大多数情况下,长相干信号的度量不能解析计算,甚至由于数值精度的限制,其数值计算也是不可能的。在本文中,我们展示了一个通用的相位分解技术,能够使模板度量分析计算。我们还将展示如何使用这些变量以稳健的方式区分可能影响分析管道的天体物理信号和非平稳噪声伪影。

英文摘要:

A type of gravitational-wave signals in the LIGO-Virgo sensitivity band are expected to be emitted by spinning asymmetric neutron stars, with rotational frequencies that could plausibly emit continuous gravitational radiation in the most sensitive band of the LIGO-Virgo detectors. The most important feature of such kind of signals is in their phase evolution, which is stable over a long observation run. When using analysis based on matched filtering, the phase evolution of long-coherent signals is needed to define how to build a proper template grid in order to gain the best signal-to-noise ratio possible. This information is encoded in a matrix called \textit{phase metric}, which characterizes the geometry for the likelihood given by the matched filtering. Most of the times, the metric for long-coherent signals cannot be computed anlaytically and even its numerical computation is not possible due to numerical precision. In this paper we show a general phase decomposition technique able to make the template metric analytically computable. We will also show how this variables can be employed to distinguish in a robust way among astrophysical signals and non-stationary noise artifacts that may affect analysis pipelines.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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