标题： 通过引力波对轴子暗物质的观测约束 显示英文标题

标题： Observational constraint on axion dark matter with gravitational waves

摘要： 宇宙中的大部分物质是不可见且未知的，被称为暗物质。 暗物质的一个候选者是轴子，它是一种超轻粒子，作为解决CP问题的解决方案而被提出。 轴子在星系晕中形成云团，放大并延迟在云团中传播的部分引力波。 银河系被由多个轴子斑块组成的暗物质晕包围。 因此，总是预期在报告的致密双星合并引力波信号之后出现特征性的次级引力波。 在本文中，我们推导了次级引力波的真实振幅。 然后我们使用一种针对它们优化的方法搜索具有特征时间延迟和持续时间的引力波。 我们没有发现显著的信号。 假设轴子是暗物质的主要成分，我们得到了轴子与引力的宇称破坏部分耦合的限制，在质量范围 [$1.7 \times 10^{-13}, 8.5 \times 10^{-12}$]$\mathrm{eV}$，这最多比来自重力探测器B的限制强$\sim 10$倍。 显示英文摘要

摘要： Most matter in the Universe is invisible and unknown, which is called dark matter. A candidate of dark matter is axion, which is an ultra-light particle motivated as a solution for the CP problem. Axions form clouds in a galactic halo, amplify, and delay a part of gravitational waves propagating in the clouds. The Milky Way is surrounded by the dark matter halo composed of a number of axion patches. Thus, the characteristic secondary gravitational waves are always expected right after the reported gravitational-wave signals from compact binary mergers. In this paper, we derive a realistic amplitude of the secondary gravitational waves. Then we search the gravitational waves having the characteristic time delay and duration with a method optimized for them. We find no significant signal. Assuming the axions are dominant component of dark matter, we obtain the constraints on the axion coupling to the parity violating sector of gravity for the mass range, [$1.7 \times 10^{-13}, 8.5 \times 10^{-12}$]$\mathrm{eV}$, which is at most $\sim 10$ times stronger than that from Gravity Probe B.