论文标题
通货膨胀后轴：轴突卤素的最小靶标
Post-inflationary axions: a minimal target for axion haloscopes
论文作者
论文摘要
如果剩余$ \ mathbb {z} _n $对称性具有很小的显式破裂，则带有域墙数$ n> 1 $的轴线状粒子（ALP）可能是暗物质。尽管我们无法可靠地确定系统的全部动力学，但我们提供了证据表明，这种ALP可以考虑到观察到的暗物质丰度，同时具有相对较小的衰变常数，因此可能与光子耦合可能很大。特别是，我们确定了使用数值模拟形成的时间，确定每个哈勃斑块的域壁数，并将其与有关后续动力学的分析期望相结合。我们表明，对衰减常数的最强限制很可能来自在小空间尺度下以较大的同化波动产生的暗物质阿尔卑斯山。我们还评论了可能从这些过度繁殖中形成的暗物质小规模结构的不确定性，尤其是指出了$ n = 1 $案例中量子压力的重要性。
An axion-like-particle (ALP) in the post-inflationary scenario with domain wall number $N>1$ can be dark matter if the residual $\mathbb{Z}_N$ symmetry has a small explicit breaking. Although we cannot determine the full dynamics of the system reliably, we provide evidence that such an ALP can account for the observed dark matter abundance while having a relatively small decay constant and consequently a possibly large coupling to photons. In particular, we determine the number of domain walls per Hubble patch around the time when they form using numerical simulations and combine this with analytic expectations about the subsequent dynamics. We show that the strongest constraint on the decay constant is likely to come from the dark matter ALPs being produced with large isocurvature fluctuations at small spatial scales. We also comment on the uncertainties on the dark matter small-scale structure that might form from these overdensities, in particular pointing out the importance of quantum pressure in the $N=1$ case.
