CRRfast：一种考虑非均匀复合效应的宇宙复合辐射仿真器
CRRfast: An emulator for the Cosmological Recombination Radiation with effects from inhomogeneous recombination
AI总结：
本研究开发了可快速准确模拟宇宙复合辐射的公开仿真器CRRfast，补全CLASS的ΛCDM谱畸变建模能力，证实非均匀复合的二阶效应可用于检验哈勃张力相关参数空间。
摘要：
宇宙复合辐射（Cosmological Recombination Radiation，CRR）是Λ冷暗物质（ΛCDM）模型下确定存在的谱畸变（Spectral Distortion，SD）信号之一。尽管其振幅非常小，但它为三个复合时代提供了直接探测手段，为检验我们对测得的宇宙微波背景（CMB）各向异性的宇宙学解释的核心支柱之一开辟了道路。本文中，我们以最先进的CosmoSpec代码为参考，开发了一款名为CRRfast的新型仿真器，能够快速且准确地生成适用于广泛宇宙学模型的CRR信号。CRRfast已作为独立代码以及CLASS代码的组成部分公开提供，从而补全了可通过CLASS建模的ΛCDM谱畸变源集合。借助这一新开发的流程，我们研究了ΛCDM框架下谱畸变的全部约束能力，并强调了其在实验设计优化方面的潜在未来应用。此外，我们表明复合过程的非均匀演化会对CRR谱产生二阶贡献，导致CRR特征的展宽和位移。这些二阶项可被该仿真器自然捕获，使我们能够评估ΛCDM对平均CRR的贡献，同时说明由原初磁场（Primordial Magnetic Fields，PMFs）引起的受扰复合效应。结果表明，尽管ΛCDM的方差效应可以忽略，但在超出ΛCDM的模型中，这些效应可能会显著增强。特别是在原初磁场的情况下，我们证明通过这些非线性项，与哈勃张力相关的参数空间可通过未来的CMB光谱仪进行检验。
英文摘要：
The Cosmological Recombination Radiation (CRR) is one of the guaranteed $Λ$CDM Spectral Distortion (SD) signals. Even if very small in amplitude, it provides a direct probe of the three recombination eras, opening the path for testing one of the key pillars in our cosmological interpretation of the measured CMB anisotropies. Here we develop a new emulator, CRRfast, to quickly and accurately represent the CRR for a wide range of cosmologies, using the state-of-the-art CosmoSpec code as a reference. CRRfast has been made publicly available both as stand-alone code and as part of CLASS, thereby completing the set of $Λ$CDM sources of SDs that can be modeled with CLASS. With this newly-developed pipeline we investigate the full constraining power of SDs within $Λ$CDM and highlight possible future applications to experimental design optimization. Furthermore, we show that the inhomogeneous evolution of the recombination process imprints second-order contributions to the CRR spectrum, leading to a broadening and shifting of the CRR features. These second-order terms are naturally captured by the emulator and allow us to evaluate the $Λ$CDM contributions to the average CRR as well as to illustrate the effect of perturbed recombination due to Primordial Magnetic Fields (PMFs). As it turns out, while the $Λ$CDM variance effects can be neglected, they could be significantly enhanced in the beyond-$Λ$CDM models. In particular in the case of PMFs we demonstrate that through these non-linear terms the parameter space relevant to the Hubble tension could be tested with future CMB spectrometers.
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