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arXiv 1202.4373astro-ph.CO
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对组合CMB和弱透镜测量的精细结构常数变化的未来限制

Future constraints on variations of the fine structure constant from combined CMB and weak lensing measurements

Matteo Martinelli, Eloisa Menegoni, Alessandro Melchiorri

摘要:

我们预测未来的CMB和星系透镜调查的能力,以约束精细结构常数的变化。我们发现,透镜数据,因为那些预期从卫星实验欧几里德可以改善约束,从未来的CMB实验导致Δα/ α= 8*10^{-4}的精度。精细结构常数α的变化与哈勃常数H_0和暴胀参数作为标量谱指数n_s强烈简并。如果在复合时期α的变化大到\sim 0.5%,这些简并性可能会在宇宙学参数的测定中引起显著的偏差。

英文摘要:

We forecast the ability of future CMB and galaxy lensing surveys to constrain variations of the fine structure constant. We found that lensing data, as those expected from satellite experiments as Euclid could improve the constraint from future CMB experiments leading to a Δα/ α= 8*10^{-4} accuracy. A variation of the fine structure constant αis strongly degenerate with the Hubble constant H_0 and with inflationary parameters as the scalar spectral index n_s. These degeneracies may cause significant biases in the determination of cosmological parameters if a variation in αas large as \sim 0.5 % is present at the epoch of recombination.

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