arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2409.12940astro-ph.COhep-ph
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塑造暗光子谱畸变

Shaping Dark Photon Spectral Distortions

Giorgi Arsenadze, Andrea Caputo, Xucheng Gan, Hongwan Liu, Joshua T. Ruderman

AI总结:

利用COBE-FIRAS数据,通过格林函数方法精确计算光子注入/移除引起的CMB谱畸变,对暗光子质量$10^{-10}$至$10^{-4}$ eV设定稳健限制,并揭示畸变谱形状作为暗光子振荡的关键特征。

摘要:

宇宙微波背景(CMB)光谱是探索标准模型之外物理的非凡工具。其测量的极高精度使其对隐藏扇区相互作用引起的微小效应特别敏感。特别是,CMB谱畸变可以揭示与标准光子动力学耦合的暗光子的存在。在这项工作中,我们使用COBE-FIRAS数据集,对从$10^{-10}$到$10^{-4}$ eV的大范围暗光子质量,推导出光子到暗光子振荡的准确且稳健的限制。我们详细考虑了约束的红移依赖性,使用格林函数方法计算由光子注入/移除引起的CMB畸变。我们的处理改进了先前的结果,先前的结果是通过研究重子中的能量注入/移除而非光子注入/移除来设定限制,或者忽略了畸变的红移演化。我们的处理与先前处理之间的差异在预测的畸变谱形状上尤为明显,这是光子到暗光子振荡的烟枪特征。谱形状的表征对未来CMB任务至关重要,这些任务可以将当前灵敏度提高数个数量级,探索暗光子参数空间中否则难以到达的区域。

英文摘要:

The cosmic microwave background (CMB) spectrum is an extraordinary tool for exploring physics beyond the Standard Model. The exquisite precision of the measurement makes it particularly sensitive to small effects caused by hidden sector interactions. In particular, CMB spectral distortions can unveil the existence of dark photons which are kinetically coupled to the standard photon. In this work, we use the COBE-FIRAS dataset to derive accurate and robust limits on photon-to-dark-photon oscillations for a large range of dark photon masses, from $10^{-10}$ to $10^{-4}$ eV. We consider in detail the redshift dependence of the bounds, computing CMB distortions due to photon injection/removal using a Green's function method. Our treatment improves on previous results, which had set limits studying energy injection/removal into baryons rather than photon injection/removal, or ignored the redshift evolution of distortions. The difference between our treatment and previous ones is particularly noticeable in the predicted spectral shape of the distortions, a smoking gun signature for photon-to-dark-photon oscillations. The characterization of the spectral shape is crucial for future CMB missions, which could improve the present sensitivity by orders of magnitude, exploring regions of the dark photon parameter space that are otherwise difficult to access.

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