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arXiv 2102.01082hep-phastro-ph.CO
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来自更轻的QCD轴子的暗物质：捕获的未对准

Dark matter from an even lighter QCD axion: trapped misalignment

Luca Di Luzio, Belen Gavela, Pablo Quilez, Andreas Ringwald

备注：
48 pages, 21 figures. v2: Published version in JCAP
发表信息：
JCAP 10 (2021) 001
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摘要：

我们表明，暗物质可以占一个轴子，解决了强CP问题，但比平常轻得多，由于$Z_\mathcal{N}$对称性。从规范QCD轴子到超轻区的整个质量范围都是允许的，有$3\le\mathcal{N}\lesssim65$。这包括第一个提议的“模糊暗物质“QCD轴子与$m_a\sim10^{-22}$电子伏特。由于$Z_{\mathcal{N}}$轴子势的特殊温度依赖性，出现了一种新的失准机制--{ \it陷阱失准}。暗物质遗迹密度的增强是因为轴子场经历了两个阶段的振荡：它首先被困在错误的最小值，这有效地延迟了真正振荡的开始。捕获的错位比这里讨论的设置更普遍，并且可以在高温下出现额外的Peccei-Quinn断裂源时保持。此外，它将被证明，捕获的错位可以动态源最近提出的动力学错位机制。所有的参数空间都在未来几十年的实验项目的范围内。例如，即使是卡斯珀电气的第一阶段也可以发现这个轴子。

英文摘要：

We show that dark matter can be accounted for by an axion that solves the strong CP problem, but is much lighter than usual due to a $Z_\mathcal{N}$ symmetry. The whole mass range from the canonical QCD axion down to the ultra-light regime is allowed, with $3\le\mathcal{N}\lesssim65$. This includes the first proposal of a "fuzzy dark matter" QCD axion with $m_a\sim10^{-22}$ eV. A novel misalignment mechanism occurs --{\it trapped misalignment}-- due to the peculiar temperature dependence of the $Z_{\mathcal{N}}$ axion potential. The dark matter relic density is enhanced because the axion field undergoes two stages of oscillations: it is first trapped in the wrong minimum, which effectively delays the onset of true oscillations. Trapped misalignment is more general than the setup discussed here, and may hold whenever an extra source of Peccei-Quinn breaking appears at high temperatures. Furthermore, it will be shown that trapped misalignment can dynamically source the recently proposed kinetic misalignment mechanism. All the parameter space is within tantalizing reach of the experimental projects for the next decades. For instance, even Phase I of CASPEr-Electric could discover this axion.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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