New scenario of QCD axion clump formation. Part I. Linear analysis
New scenario of QCD axion clump formation. Part I. Linear analysis
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QCD 轴子团块形成的新场景。
DOI：
10.1088/1475-7516/2022/03/039
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发表时间：
2022
影响因子：
6.4
通讯作者：
Urakawa Yuko
中科院分区：
文献类型：
--
作者：
Kitajima Naoya;Kogai Kazuhiro;Urakawa Yuko
QCD轴子通过QCD相变周围QCD物质的非微扰效应获得势能。在此期间，轴子和QCD物质之间的直接相互作用开始了。专注于这种直接相互作用的影响，我们提出了两种情况下，波动的轴子可以迅速增长，可能导致形成的轴子微集群，即使Peccei-Quinn（PQ）对称性已经打破通货膨胀期间。第一种情况假设在QCD时期视界尺度上的原始曲率扰动显著增强，第二种情况假设初始失准在势能的山顶附近调谐。
The QCD axion acquires the potential through the non-perturbative effect of the QCD matters around the QCD phase transition. During this period, the direct interaction between the axion and the QCD matters sets in. Focusing on the impact of this direct interaction, we propose two scenarios where the fluctuation of the axion can rapidly grow, potentially leading to the formation of axion miniclusters even if the Peccei-Quinn (PQ) symmetry was already broken during inflation. The first scenario assumes that the primordial curvature perturbation at the horizon scale during the QCD epoch was significantly enhanced and the second one assumes that the initial misalignment was tuned around the hilltop of the potential.