Cosmology with Rayleigh scattering of the cosmic microwave background
Cosmology with Rayleigh scattering of the cosmic microwave background
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DOI：
10.1088/1475-7516/2021/01/060
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发表时间：
2020-08
影响因子：
6.4
通讯作者：
B. Beringue;P. Meerburg;Joel Meyers;N. Battaglia
中科院分区：
文献类型：
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作者：
B. Beringue;P. Meerburg;Joel Meyers;N. Battaglia
宇宙微波背景辐射（CMB）一直是宇宙学的宝库。在未来十年中，目前和计划中的CMB实验预计将耗尽几乎所有的原始CMB信息。为了进一步约束宇宙学模型，测量主模之外的信号有很大的好处。宇宙微波背景辐射的瑞利散射是宇宙学信息的一个来源。它是由复合过程中形成的中性物质对CMB光子的额外散射引起的，并表现出强烈而独特的频率标度（λ ν4）。我们将证明，在频率通道上具有足够的灵敏度，瑞利散射信号不仅应该是可检测的，而且可以显着提高宇宙学参数的约束能力，对计划的实验进行有限或没有额外的修改。我们将提供启发式的解释，为什么某些宇宙学参数受益于瑞利散射信号的测量，并确认这些直觉使用Fisher形式主义。特别地，瑞利散射的观测允许对Neff和Σ mν的测量的显著改进。
The cosmic microwave background (CMB) has been a treasure trove for cosmology. Over the next decade, current and planned CMB experiments are expected to exhaust nearly all primary CMB information. To further constrain cosmological models, there is a great benefit to measuring signals beyond the primary modes. Rayleigh scattering of the CMB is one source of additional cosmological information. It is caused by the additional scattering of CMB photons by neutral species formed during recombination and exhibits a strong and unique frequency scaling (∝ ν4). We will show that with sufficient sensitivity across frequency channels, the Rayleigh scattering signal should not only be detectable but can significantly improve constraining power for cosmological parameters, with limited or no additional modifications to planned experiments. We will provide heuristic explanations for why certain cosmological parameters benefit from measurement of the Rayleigh scattering signal, and confirm these intuitions using the Fisher formalism. In particular, observation of Rayleigh scattering allows significant improvements on measurements of Neff and ∑ mν.