The LIGO and Virgo scientific collaborations have cataloged ten confident detections from binary black holes and one from binary neutron stars in their first two observing runs, which has already brought up an immense desire among the scientists to study the universe and to extend the knowledge of astrophysics from these compact objects. One of the fundamental noise sources limiting the achievable detector bandwidth is given by Newtonian noise arising from terrestrial gravity fluctuations. It is important to model Newtonian noise spectra very accurately as it cannot be monitored directly using current technology. In this article, we show the reduction in the Newtonian noise curve obtained by more accurately modelling the current configuration of the Virgo observatory. In Virgo, there are clean rooms or recess like structures underneath each test mirror forming the main two Fabry-Perot arm cavities of the detector. We compute the displacements originating from an isotropic Rayleigh field including the recess structure. We find an overall strain noise reduction factor of 2 in the frequency band from 12 to about 15 Hz relative to previous models. The reduction factor depends on frequency and also varies between individual test masses.

中文翻译：

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处女座引力波天文台的牛顿噪声重新评估，包括局部凹陷结构

LIGO 和 Virgo 的科学合作在前两次观测中记录了 10 次来自双黑洞和 1 次来自双中子星的可靠探测，这已经激发了科学家们研究宇宙和扩展天体物理学知识的巨大愿望。从这些紧凑的物体。限制可达到的探测器带宽的基本噪声源之一是由地球重力波动引起的牛顿噪声给出的。非常准确地模拟牛顿噪声谱非常重要，因为它不能使用当前技术直接监测。在本文中，我们展示了通过更准确地模拟室女座天文台的当前配置而获得的牛顿噪声曲线的降低。在处女座，每个测试镜下方有洁净室或类似凹槽的结构，形成探测器的两个主要法布里-珀罗臂腔。我们计算源自各向同性瑞利场的位移，包括凹槽结构。我们发现相对于以前的模型，在 12 到大约 15 Hz 的频带中的整体应变降噪因子为 2。折减系数取决于频率，并且在各个测试质量之间也有所不同。