Observational constraint on axion dark matter with gravitational waves
Observational constraint on axion dark matter with gravitational waves
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DOI：
10.1103/physrevd.106.l081301
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发表时间：
2022-07
影响因子：
5
通讯作者：
T. Tsutsui;A. Nishizawa
中科院分区：
文献类型：
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作者：
T. Tsutsui;A. Nishizawa
宇宙中的大多数物质都是不可见和未知的，它们被称为暗物质。暗物质的一个候选者是轴子，它是一种超轻粒子，被激发为CP问题的解决方案。轴子在星系晕中形成云，放大和延迟部分在云中传播的引力波。银河系被由许多轴子斑块组成的暗物质晕所包围。因此，在密集双星并合的引力波信号之后，通常会出现具有特征的二次引力波。在本文中，我们推导出了一个真实的次引力波振幅。然后用一种优化的方法搜索具有特征时滞和特征持续时间的引力波。我们没有发现明显的信号。假设轴子是暗物质的主要组成部分，我们得到了质量范围内轴子耦合到引力宇称违反扇区的约束，[$1.7 \乘以10^{-13}，8.5 \乘以10^{-12}$]$\ mathm {eV}$，它比重力探测器B的约束强10倍。
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.