Ultralight dark matter induces time-dependent perturbations in the spacetime metric, enabling its . In this Letter, we propose using astrometry to detect dark matter. After reviewing the calculation of the metric in the presence of scalar dark matter, we study the influence of the perturbations on the apparent motion of astrophysical bodies. We apply our results to angular position measurements of quasars, whose vast distances from Earth present an opportunity to discover subcomponent dark matter with a mass as low as 10−33eV. We explore the prospects of very long baseline interferometry and optical astrometric survey measurements for detecting ultralight relics, finding that for the smallest masses, current astrometric surveys can detect dark matter moving locally with a velocity of 10−3 with energy density as low as 3×10−11 GeV/cm3. Published by the American Physical Society 2025

中文翻译：

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天体测量直接探测超轻暗物质的新方法


超轻暗物质在时空度量中引起时间依赖性扰动，使其 .在这封信中，我们建议使用天体测量法来探测暗物质。在回顾了标量暗物质存在下的度量计算之后，我们研究了扰动对天体物理物体视运动的影响。我们将结果应用于类星体的角位置测量，类星体距离地球很远，这为发现质量低至 10-33eV 的亚成分暗物质提供了机会。我们探索了超长基线干涉测量和光学天体测量测量在探测超轻遗迹方面的前景，发现对于最小的质量，目前的天体测量可以探测到以 10-3 的速度局部移动的暗物质，能量密度低至 3×10-11 GeV/cm3。 美国物理学会 2025 年出版