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arXiv 1504.04724gr-qc
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全张量引力波探测器中的牛顿噪声抵消

Newtonian-noise cancellation in full-tensor gravitational-wave detectors

Jan Harms, Ho Jung Paik

摘要:

由周围地震和次声场产生的地球重力噪声,也称为牛顿噪声,将成为低频地面引力波探测器的主要灵敏度限制之一。据估计,在10 mHz到1 mHz的频带内,这种噪声前景需要被抑制大约3 - 5个数量级,这将是非常具有挑战性的。在这篇文章中,我们提出了一种新的方法,大大有利于消除重力噪声的全张量GW探测器。该方法使用张量通道和环境传感器(如地震仪和麦克风)的最佳组合来降低重力噪声。它明确使用GW的传播方向,因此可以在GW的定向搜索或已知源的观测中实现。我们表明,抑制牛顿噪声前景是非常方便的使用额外的应变通道在全张量GW探测器。只需要少量的辅助,高灵敏度的环境传感器来实现几个数量级的噪声抑制。

英文摘要:

Terrestrial gravity noise, also known as Newtonian noise, produced by ambient seismic and infrasound fields will pose one of the main sensitivity limitations in low-frequency, ground-based, gravitational-wave (GW) detectors. It was estimated that this noise foreground needs to be suppressed by about 3 -- 5 orders of magnitude in the frequency band 10\,mHz to 1\,Hz, which will be extremely challenging. In this article, we present a new approach that greatly facilitates cancellation of gravity noise in full-tensor GW detectors. The method uses optimal combinations of tensor channels and environmental sensors such as seismometers and microphones to reduce gravity noise. It makes explicit use of the direction of propagation of a GW, and can therefore either be implemented in directional searches for GWs or in observations of known sources. We show that suppression of the Newtonian-noise foreground is greatly facilitated using the extra strain channels in full-tensor GW detectors. Only a modest number of auxiliary, high-sensitivity environmental sensors are required to achieve noise suppression by a few orders of magnitude.

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