论文标题
重新审视了CMB光谱扭曲：从Firas数据中对$μ$扭曲和原始非高斯的新提示
CMB spectral distortions revisited: a new take on $μ$ distortions and primordial non-Gaussianities from FIRAS data
论文作者
论文摘要
与CMB的黑体光谱能分布的偏差是对早期宇宙（例如与粒子衰变和通货膨胀相关的）和以后（例如，电离和天体发射）的精确探针。在1990年代初期Cobe卫星上的FIRAS仪器的开创性测量之后，在表征这些光谱扭曲的表征方面取得了有限的进展，该测量主要针对其在天空中的平均幅度的测量。由于目前尚未计划更新FIRAS测量，因此在这项工作中，我们重新分析了FIRAS数据，并在天空中产生了$ $ $ $ type的光谱失真。我们对$μ$失真单极$ | \langleμ\ rangle | <47 \ times 10^{ - 6} $在95 \％置信度下，以$ \ sim 2 $的因子将较高的FIRAS估算提高，我们提供了更新的约束。 We also constrain primordial non-Gaussianities of curvature perturbations on scales $10\lesssim k\lesssim 5\times 10^4$ through the cross-correlation of $μ$ distortion anisotropies with CMB temperature and, for the first time, the full set of polarization anisotropies from the Planck satellite.我们在$ f _ {\ rm nl} \ Lessim 3.6 \ times 10^6 $上获得上限，并在其运行$ n _ {\ rm nl} \ Lessim 1.4 $上受到FIRAS敏感性的限制，但对firas敏感性的限制，但可靠地抗银河系和外层面前景污染物。我们根据普朗克卫星的数据重新访问先前的类似分析，并表明，尽管有适当地考虑了所有工具性和天体物理不确定性，但尽管噪声明显降低，但它们的结果明显较低或更差。我们的工作是第一个从光谱仪中分析数据的人，并证明了这种工具的力量，以减少系统的不确定性来执行这种科学案例。
Deviations from the blackbody spectral energy distribution of the CMB are a precise probe of physical processes active both in the early universe (such as those connected to particle decays and inflation) and at later times (e.g. reionization and astrophysical emissions). Limited progress has been made in the characterization of these spectral distortions after the pioneering measurements of the FIRAS instrument on the COBE satellite in the early 1990s, which mainly targeted the measurement of their average amplitude across the sky. Since at present no follow-up mission is scheduled to update the FIRAS measurement, in this work we re-analyze the FIRAS data and produce a map of $μ$-type spectral distortion across the sky. We provide an updated constraint on the $μ$ distortion monopole $|\langleμ\rangle|<47\times 10^{-6}$ at 95\% confidence level that sharpens the previous FIRAS estimate by a factor of $\sim 2$. We also constrain primordial non-Gaussianities of curvature perturbations on scales $10\lesssim k\lesssim 5\times 10^4$ through the cross-correlation of $μ$ distortion anisotropies with CMB temperature and, for the first time, the full set of polarization anisotropies from the Planck satellite. We obtain upper limits on $f_{\rm NL}\lesssim 3.6 \times 10^6$ and on its running $n_{\rm NL}\lesssim 1.4$ that are limited by the FIRAS sensitivity but robust against galactic and extragalactic foreground contaminations. We revisit previous similar analyses based on data of the Planck satellite and show that, despite their significantly lower noise, they yield similar or worse results to ours once all the instrumental and astrophysical uncertainties are properly accounted for. Our work is the first to self-consistently analyze data from a spectrometer and demonstrate the power of such instrument to carry out this kind of science case with reduced systematic uncertainties.
