VIRGO牛顿噪声再评估
VIRGO Newtonian-noise reassessment
摘要：
LIGO和Virgo科学合作在前两次观测运行中已经编目了来自双黑洞的10个可靠的探测结果和来自双中子星的一个探测结果，这已经引起了科学家们对研究宇宙和扩展这些紧凑物体的天体物理学知识的巨大愿望。限制可实现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。非常精确地模拟牛顿噪声频谱是非常重要的，因为它不能使用当前技术直接监测。在这篇文章中，我们将展示通过更精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减少。在Virgo中，在每个测试镜下面有洁净室或类似凹进的结构，形成探测器的主要两个法布里-珀罗臂腔。我们计算位移起源于一个各向同性瑞利场，包括凹陷结构。我们发现，相对于以前的模型，在12至约15 Hz的频带中的整体应变噪声降低因子为2。折减系数取决于频率，也因单个试验质量而异。
英文摘要：
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.
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