轴子诱导的宇宙微波背景斑块状屏蔽
Axion-Induced Patchy Screening of the Cosmic Microwave Background
AI总结：
本研究计算了轴子诱导的CMB斑块状屏蔽对相关函数的贡献，并预测了现有及未来巡天对光子-轴子耦合的灵敏度，表明与unWISE结合可探测至3×10⁻¹² GeV⁻¹，CMB-S4可再扩展近一个数量级。
摘要：
宇宙微波背景（CMB）光子可以在非线性大尺度结构（LSS）内分布的磁化等离子体中发生共振转换为轴子。这一过程导致轴子诱导的斑块状屏蔽：产生具有特征性非黑体频率依赖性的次级温度和偏振各向异性，这些各向异性与我们过去光锥上的LSS分布强相关。我们在晕模型框架内计算了轴子诱导的斑块状屏蔽对包含CMB各向异性和LSS示踪物的两点和三点相关函数的贡献。我们利用这些结果预测了现有和未来巡天对光子-轴子耦合的灵敏度，针对轴子质量在$2\ imes 10^{-13}$ eV至$3\ imes 10^{-12}$ eV之间，结合了来自普朗克数据对仪器噪声和前景贡献的经验估计，以及仅在未来数据集可及的角尺度上的模型化贡献。我们证明，利用普朗克和unWISE星系目录的分析将补充最灵敏的现有天体物理轴子搜索，探测到低至$3\ imes 10^{-12} \, {\ m GeV}^{-1}$的耦合，而未来巡天如CMB-S4的观测可将这一探测范围再扩展近一个数量级。
英文摘要：
Cosmic Microwave Background (CMB) photons can undergo resonant conversion into axions in the presence of magnetized plasma distributed inside non-linear large-scale structure (LSS). This process leads to axion-induced patchy screening: secondary temperature and polarization anisotropies with a characteristic non-blackbody frequency dependence that are strongly correlated with the distribution of LSS along our past light cone. We compute the axion-induced patchy screening contribution to two- and three- point correlation functions that include CMB anisotropies and tracers of LSS within the halo model. We use these results to forecast the sensitivity of existing and future surveys to photon-axion couplings for axion masses between $2\times 10^{-13}$ eV and $3\times 10^{-12}$ eV, using a combination of empirical estimates from Planck data of the contribution from instrumental noise and foregrounds as well as modeled contributions on angular scales only accessible with future datasets. We demonstrate that an analysis using Planck and the unWISE galaxy catalogue would be complementary to the most sensitive existing astrophysical axion searches, probing couplings as small as $3\times 10^{-12} \, {\rm GeV}^{-1}$, while observations from a future survey such as CMB-S4 could extend this reach by almost an additional order of magnitude.
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