具有无畴壁问题的非完美轴子
Imperfect axions with no domain wall problem
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中文总结 AI 辅助
研究解决了畴壁数N>1的轴子理论的畴壁问题，通过引入PQ破缺算符，在f_a ≤ 10^10 GeV的参数区域实现轴子弦提前摧毁，其中子电偶极矩有望被未来实验探测。
中文摘要 AI 辅助
暴胀后畴壁数N>1的轴子理论存在畴壁问题。我们通过解析推导并结合模拟证实，这类理论在引入额外PQ破缺算符后，存在唯象上可行的参数空间区域。与传统图像不同，这类理论中超出QCD的PQ破缺会在QCD轴子势具有宇宙学相关性之前摧毁轴子弦。该区域对应轴子衰变常数f_a ≤ 10^10 GeV，指向QCD轴子质量在10^-3至10^-2 eV范围内。所需的额外PQ破缺会使中子电偶极矩处于当前实验限的两个数量级以内，有望在即将开展的中子电偶极矩实验中探测到。
英文摘要
Post-inflationary axion theories with domain wall number $N>1$ suffer from a domain wall problem. We show analytically, and confirm via simulations, that there is a region of phenomenologically viable parameter space for such theories with additional PQ-violating operators. Contrary to the conventional picture, in such theories the beyond-QCD PQ violation destroys the axion strings before the QCD axion potential becomes cosmologically relevant. This regime is realized for axion decay constants $f_a \lesssim 10^{10} \, \rm GeV$, pointing to a QCD axion mass in the $10^{-3}-10^{-2}\,{\rm eV}$ range. The required additional PQ violation induces a neutron electric dipole moment within two orders of magnitude of the current experimental limit, placing it within the reach of upcoming neutron electric dipole moment experiments.
