论文标题
小行星的重力梯度噪声
Gravity Gradient Noise from Asteroids
论文作者
论文摘要
附近的大体体的重力耦合无法屏蔽重力波（GW）检测器中的质量，并在检测器中产生“重力梯度噪声”（GGN）。在本文中，我们表明，对于使用内部太阳系中局部测试量的任何GW检测器，来自$ \ sim 10^5 $内部太阳系小行星的ggn的GGN为检测GW提供了不可减至的噪声底，该噪声在低频下呈指数增长。这严重限制了使用本地测试量的GW检测的前景，用于频率$ f _ {\ text {gw}}} \ lysesim（\ text {fext {firt}）\ times 10^{ - 7} \，$ hz。在较高的频率下，我们发现小行星GGN迅速下降，以至于可能是可能的。但是，现有的小行星目录在小身体方面的不完整使这是一个围绕$ f _ {\ text {gw}} \simμ$ $ Hz的开放问题，并需要进一步研究。我们表明，将其放置在外部太阳系中的检测网络不会被$ \ sim 10 \，$ nhz以上的噪声所淹没，并且对可以克服$ \ sim 10 \，$ nhz-$ nhz- $μ$ Hz band的替代方法的替代方法发表评论。
The gravitational coupling of nearby massive bodies to test masses in a gravitational wave (GW) detector cannot be shielded, and gives rise to 'gravity gradient noise' (GGN) in the detector. In this paper we show that for any GW detector using local test masses in the Inner Solar System, the GGN from the motion of the field of $\sim 10^5$ Inner Solar System asteroids presents an irreducible noise floor for the detection of GW that rises exponentially at low frequencies. This severely limits prospects for GW detection using local test masses for frequencies $f_{\text{GW}} \lesssim (\text{few})\times 10^{-7}\,$Hz. At higher frequencies, we find that the asteroid GGN falls rapidly enough that detection may be possible; however, the incompleteness of existing asteroid catalogs with regard to small bodies makes this an open question around $f_{\text{GW}}\sim μ$Hz, and further study is warranted. We show that a detector network placed in the Outer Solar System would not be overwhelmed by this noise above $\sim 10\,$nHz, and make comments on alternative approaches that could overcome the limitations of local test masses for GW detection in the $\sim 10\,$nHz-$μ$Hz band.
