分层轴子域
Hierarchical Axiverse
AI总结：
该研究针对弦紧致化产生的约100个类轴子粒子，利用QCD诱导质量混合和随机混合，提出分层轴子域模式，其质量与衰变常数呈分层分布且满足沼泽地约束。
AI中文摘要：
弦紧致化通常会产生约100个类轴子轻粒子，但此前未利用低能混合作为其能谱的结构化约束。我们表明，QCD诱导的质量混合的明确定义要求将轴子质量强制为分层间距排列，而随机混合则将衰变常数组织成分层分裂分布——两个群体被一个基本空的窗口分隔。这两种模式对紫外输入不敏感，且在标准大体积极限紧致化中满足相关沼泽地（Swampland）约束，我们将这种涌现模式称为分层轴子域（hierarchical axiverse）。
英文摘要：
String compactifications generically produce ${\cal O}(100)$ light axion-like particles, yet low-energy mixing has not previously been exploited as a structuring constraint on their spectrum. We show that the requirement of well-defined QCD-induced mass mixing forces the axion masses into a hierarchically spaced ordering, while stochastic mixing organizes the decay constants into a hierarchically split distribution -- two populations separated by an essentially empty window. Both patterns are insensitive to ultraviolet input and satisfy the relevant Swampland constraints within standard large-volume compactifications. We term this emergent pattern the hierarchical axiverse.
