用光学悬浮传感器寻找复合暗物质
Search for composite dark matter with optically levitated sensors
摘要：
结果报告从搜索一类复合暗物质模型与正常物质的弱，远程相互作用。我们通过监测光学悬浮的纳克质量的机械运动，在几天的过程中寻找通过暗物质粒子产生的脉冲。假设这些粒子构成了暗物质的主要成分，对于质量在1 - 10 TeV之间的暗物质和质量为$m_ϕ\leq 0.1$ eV的介质，该搜索将它们与$α_n \leq 1.2 \times 10^{-7}$中子的相互作用的上限设置为95%置信度。由于暗物质从纳克质量（$\sim 10^{29}$倍，为单个中子）相干散射的横截面的大幅增强，以及检测小至$\sim$ 200 MeV/c的动量转移的能力，这些结果提供了对某些类别的复合暗物质模型的灵敏度，这些模型大大超过了现有的搜索，包括那些采用千克级或吨级目标的模型。这些技术的扩展可以使方向敏感的搜索以前无法访问的重暗物质候选人的广泛类别。
英文摘要：
Results are reported from a search for a class of composite dark matter models with feeble, long-range interactions with normal matter. We search for impulses arising from passing dark matter particles by monitoring the mechanical motion of an optically levitated nanogram mass over the course of several days. Assuming such particles constitute the dominant component of dark matter, this search places upper limits on their interaction with neutrons of $α_n \leq 1.2 \times 10^{-7}$ at 95\% confidence for dark matter masses between 1--10 TeV and mediator masses $m_ϕ\leq 0.1$ eV. Due to the large enhancement of the cross-section for dark matter to coherently scatter from a nanogram mass ($\sim 10^{29}$ times that for a single neutron) and the ability to detect momentum transfers as small as $\sim$200 MeV/c, these results provide sensitivity to certain classes of composite dark matter models that substantially exceeds existing searches, including those employing kg-scale or ton-scale targets. Extensions of these techniques can enable directionally-sensitive searches for a broad class of previously inaccessible heavy dark matter candidates.
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