厚月皮放大了半Hz 感知引力波信号
摘要
0.01~1 Hz 频段的引力波 (GW) 编码了早期宇宙和合并致密天体的独特特征，但超出现有观测站的覆盖范围。理论模型表明，月球可作为共挭探测器，但其崎岖表面和异质内部的未知影响构成了对其响应建模的挑战。本文通过构建首个高分辨率二维月球 GW 响应模型来解决这一长期问题，该模型比以往模型更真实。我们通过将高保真谱元仿真与正规振荡理论的分析力相结合，实现了以 2 km 网格分辨率解析地形效应，同时保持辨识全局自由振荡模式的能力。这种双方法不仅恢复了预期的主要二极点 () 振荡模式，还暴露了厚皮层区域的系统性信号放大效应。该放大效应 traced by our normal-mode analysis to a mode-coupling process, in which the original quadrupolar oscillation induced by the passing GW distributes energy into a series of higher-order modes, the hybridized eigenmodes of a laterally heterogeneous Moon. In certain narrow frequency ranges, we observe up to tenfold amplification spanning into the deci-hertz band, highlighting the power of numerical simulations in resolving these structurally fine-tuned features for designing future detectors. Our work establishes the Moon as a resonant GW detector albeit its complex topographical structures, and the resulting amplification maps provide quantitative guide for the optimal landing site selection.
引用
@article{arxiv.2601.16567,
title = {Thick Lunar Crust Amplifies Deci-Hertz Gravitational-Wave Signal},
author = {Lei Zhang and Han Yan and Xian Chen and Jinhai Zhang},
journal= {arXiv preprint arXiv:2601.16567},
year = {2026}
}