发表机构
National Central University; Center for High Energy and High Field (CHiP), National Central University; Institute of Physics, Academia Sinica; Institute of Particle and Nuclear Studies, High Energy Acceleration Research Organization (KEK); Phenikaa University; Department of Physics, Rikkyo University; Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), WPI, UTIAS, The University of Tokyo（中央大学; 高能高场中心; 中央研究院物理研究所; 高能加速器研究机构粒子核研究部; 菲尼亚卡大学; 立教大学物理系; 东京大学理学院宇宙线物质宇宙国际研究教育中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出用材料不对称Sagnac速度计搜索$B-L$矢量暗物质，在低质量端比位置计灵敏度提高近两个数量级，为低质量暗物质搜索提供新途径。
AI 中文摘要
我们首次展示了材料不对称的Sagnac速度计可以将对$B-L$矢量暗物质的量子噪声限制灵敏度在频带低质量端比法布里-珀罗迈克尔逊位置计提高近两个数量级。我们在双环干涉仪中引入材料对比度来探测依赖于成分的$B-L$力，并在相同入射功率、输入镜透射率和腔往返长度下比较两种配置。对于蓝宝石镜片和一周的基准时间，仅考虑量子噪声时的中位预期95%置信水平上限在$m_A=4.1\times10^{-14}\\,\mathrm{eV}/c^2$（$10\\,\mathrm{Hz}$）处达到$1.2\times10^{-27}$，提高了57倍。这个频带边缘预测假设经典噪声可忽略；在$10\\,\mathrm{Hz}$处的灵敏度对于可实现悬挂和隔离系统尚未确立。材料引起的位移在两种配置中基本相同，增益来自低频量子反作用的减少。这些结果将速度计读出确定为向更低质量矢量暗物质搜索的有前景途径。
英文摘要
We present the first calculation showing that a material-asymmetric Sagnac speed meter can improve quantum-noise-limited sensitivity to $B-L$ vector dark matter by nearly two orders of magnitude over a Fabry--Perot Michelson position meter at the low-mass end of the band. We introduce material contrast into a dual-ring interferometer to probe composition-dependent $B-L$ forces and compare the two configurations at equal incident power, input-mirror transmissivity, and cavity round-trip length. For sapphire mirrors and a one-week benchmark, the quantum-noise-only median expected $95\%$ CL upper limit reaches $1.2\times10^{-27}$ at $m_A=4.1\times10^{-14}\,\mathrm{eV}/c^2$ ($10\,\mathrm{Hz}$), a factor-$57$ improvement. This band-edge forecast assumes negligible classical noise; sensitivity at $10\,\mathrm{Hz}$ is not established for a realizable suspension and isolation system. The material-induced displacement is essentially identical in both configurations, with the gain arising from reduced low-frequency quantum backaction. These results identify speed-meter readout as a promising route to lower-mass vector-dark-matter searches.
Comments8 pages, 3 figures
