各向异性宇宙双折射对未来CMB实验的预测
Anisotropic cosmic birefringence estimates for forthcoming CMB experiments
浏览论文内容
中文总结 AI 辅助
本文预测未来CMB实验对各向异性宇宙双折射的灵敏度，通过斑块定位技术重建旋转角，预计可将当前约束改善10-40倍，并给出95%置信水平下的振幅上限。
中文摘要 AI 辅助
宇宙双折射（CB）是探测标准模型之外物理的独特探针，其可能来源于通过Chern-Simons相互作用与光子耦合的类轴子场。近期Planck数据分析加强了非零各向同性旋转角的证据，但其各向异性分量仍未探测到，尽管该分量是区分均匀类quintessence场与空间变化的类轴子暗物质的关键。我们预测了未来地面和空间CMB实验对各向异性CB的灵敏度，采用基于斑块（patch）的定位技术，应用于模拟的CMB加噪声图，其白噪声水平分别代表Simons Observatory SAT和LiteBIRD类灵敏度。通过最小化由EB D估计量构建的$\chi^2_{EB}$统计量，在独立的天空斑块上重建局部旋转角。在我们的理想化模拟下，预测的角功率谱将当前基于Planck的CB各向异性统计不确定性约束改善因子为：卫星类任务26-40倍，现实地面覆盖11-15倍。将这些转化为对尺度不变振幅的约束，用尺度不变振幅模型拟合重建的带功率，我们预测在95%置信水平下，空间类任务$A_{\rm CB} < 3.5\times10^{-4}\\,{\rm deg}^2$，地面覆盖$A_{\rm CB} < 7.1\times10^{-4}\\,{\rm deg}^2$，分别比当前全天Planck约束改善约20倍和10倍。这些值代表可实现增益的上限，表明未来CMB实验将能进一步揭示各向异性CB。
英文摘要
Cosmic Birefringence (CB) is a unique probe of physics beyond the Standard Model, potentially sourced by an axion-like field coupled to photons via a Chern-Simons interaction. Recent Planck analyses have strengthened evidence for a non-zero isotropic rotation angle, yet its anisotropic component remains undetected, despite being the key to distinguishing a homogeneous quintessence-like field from spatially varying axion-like dark matter. We forecast the sensitivity of forthcoming ground- and space-based CMB experiments to anisotropic CB, applying a patch-based localization technique to simulated CMB-plus-noise maps with white noise levels representative of Simons Observatory SAT- and LiteBIRD-like sensitivities. Local rotation angles are reconstructed on independent sky patches by minimizing the $χ^2_{EB}$ statistic built from the $EB$ D-estimator. Under our idealized simulations, the forecast angular power spectrum improves current Planck-based constraints on the CB anisotropy statistical uncertainty by a factor of 26-40 for a satellite-like mission and 11-15 for a realistic ground-based footprint. Translating these into constraints on the scale-invariant amplitude, fitting the reconstructed bandpowers with a scale-invariant amplitude model, we forecast with a 95 \% C.L. $A_{\rm CB} < 3.5\times10^{-4}\,{\rm deg}^2$ for the space-like mission and $A_{\rm CB} < 7.1\times10^{-4}\,{\rm deg}^2$ for the ground-based footprint, improving on the current full-sky Planck constraint by a factor of about 20 and 10, respectively. These values represent upper bounds on the achievable gain, and indicate that forthcoming CMB experiments will be able to further shed light on anisotropic CB.
发表机构
- Università degli Studi di Catania（卡塔尼亚大学）
- INFN - Sezione di Catania（意大利国家核物理研究所卡塔尼亚分部）
- INAF - Osservatorio Astrofisico di Catania（意大利国家天体物理研究所卡塔尼亚天文台）
机构由 AI 辅助整理，请以论文原文为准。
