Cosmological constraints from CMB distortion
Cosmological constraints from CMB distortion
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CMB 畸变的宇宙学约束
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
H. Tashiro
中科院分区：
文献类型：
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作者：
J. Dent;D. Easson;H. Tashiro
我们研究了宇宙微波背景(CMB)的$MU型光谱扭曲引起的绝热和等温密度起伏的界限。对这种失真的研究是对CMB测量光谱指数及其运行的补充，并将有助于将这些参数限制在小得多的尺度上。我们发现，一个数量级为10^-7的探测将与绝热微扰谱的标准宇宙学模型发生强烈的冲突。此外，我们发现，在当前CMB对等曲率模振幅的限制下，几乎不变的等曲率模(在许多曲率模型中常见)不会产生显著的$Mu失真。最后，我们表明，未来的实验将强烈地限制某些轴子模型所预测的具有高度蓝色光谱的等温模的幅度。
We examine bounds on adiabatic and isocurvature density fluctuations from $mu$-type spectral distortions of the cosmic microwave background (CMB). Studies of such distortion are complementary to CMB measurements of the spectral index and its running, and will help to constrain these parameters on significantly smaller scales. We show that a detection on the order of $mu sim 10^{-7}$ would strongly be at odds with the standard cosmological model of a nearly scale-invariant spectrum of adiabatic perturbations. Further, we find that given the current CMB constraints on the isocurvature mode amplitude, a nearly scale-invariant isocurvature mode (common in many curvaton models) cannot produce significant $mu$-distortion. Finally, we show that future experiments will strongly constrain the amplitude of the isocurvature modes with a highly blue spectrum as predicted by certain axion models.