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arXiv 1306.1232astro-ph.CO
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普朗克精细结构常数空间变化的限制

Constraints on Spatial Variations in the Fine-Structure constant from Planck

Jon O'Bryan, Joseph Smidt, Francesco De Bernardis, Asantha Cooray

摘要:

我们利用普朗克的宇宙微波背景(CMB)各向异性数据来约束精细结构常数α的空间涨落。通过CMB光子的汤普森散射,α的空间各向异性导致CMB各向异性中的高阶相关。我们使用的四点关联函数的CMB温度各向异性的基础上的二次估计提取的精细结构常数的空间变化的角功率谱投影沿视线在最后的散射表面。在数十度角标度及以上的情况下,我们将精细结构常数的均方根波动限制为δα/α_0=(1.34 +/- 5.82)x 10^-2,置信水平为95%,相对于标准值α_0。我们没有发现红移为10^3的空间变化α的证据。

英文摘要:

We use the Cosmic Microwave Background (CMB) anisotropy data from Planck to constrain the spatial fluctuations of the fine-structure constant α. Through Thompson scattering of CMB photons, spatial anisotropies of αlead to higher-order correlations in the CMB anisotropies. We use a quadratic estimator based on the four-point correlation function of the CMB temperature anisotropy to extract the angular power spectrum of the spatial variation of the fine-structure constant projected along the line of sight at the last scattering surface. At tens of degree angular scales and above, we constrain the rms fluctuations of the fine structure constant to be δα/α_0= (1.34 +/- 5.82) x 10^-2 at the 95% confidence level with respect to the standard value α_0. We find no evidence for a spatially varying αat a redshift of 10^3.

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