均匀介质中第三代地下引力波探测器的重力梯度相减
Gravity-Gradient Subtraction in 3rd Generation Underground Gravitational-Wave Detectors in Homogeneous Media
摘要：
在本文中，我们开发了一种新的方法，重力梯度噪声扣除地下引力波探测器在均匀的岩石。该方法基于地震场的空间谐波展开。它表明，重力梯度噪声产生的地震场从遥远的源，固定或非固定，可以计算出从地震数据测量本地在测试质量。此外，该公式适用于从固定的本地源的地震场。据发现，从这些领域的重力梯度可以减去使用当地的地震测量。数值结果与有限元模拟证实。提出了一种新的地震阵列设计，提供了额外的信息，所需的地震场，以确保适用性的方法，现实的情况下，即使与非均匀的岩石和非固定的本地源。
英文摘要：
In this paper, we develop a new approach to gravity-gradient noise subtraction for underground gravitational-wave detectors in homogeneous rock. The method is based on spatial harmonic expansions of seismic fields. It is shown that gravity-gradient noise produced by seismic fields from distant sources, stationary or non-stationary, can be calculated from seismic data measured locally at the test mass. Furthermore, the formula is applied to seismic fields from stationary local sources. It is found that gravity gradients from these fields can be subtracted using local seismic measurements. The results are confirmed numerically with a finite-element simulation. A new seismic-array design is proposed that provides the additional information about the seismic field required to ensure applicability of the approach to realistic scenarios even with inhomogeneous rock and non-stationary local sources.
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