标题： 利用宇宙微波背景限制精细结构常数的变化 显示英文标题

标题： Constraining Variations in the Fine-Structure Constant with the Cosmic Microwave Background

摘要： 精细结构常数的任何时间变化都会改变宇宙的电离历史，从而改变宇宙微波背景涨落的模式。 我们计算了这些涨落谱随精细结构常数变化的变化，并发现这些变化主要由氢原子结合能偏移引起的复合红移变化所主导。 我们估计下一代宇宙微波背景实验可能对约 1000 红移处的精细结构常数变化的限制精度。 我们发现此类实验可能对$|\Delta \alpha/\alpha| \sim 10^{-2} - 10^{-3}$敏感。 显示英文摘要

摘要： Any time variation in the fine-structure constant alters the ionization history of the universe and therefore changes the pattern of cosmic microwave background fluctuations. We calculate the changes in the spectrum of these fluctuations as a function of the change in the fine-structure constant, and we find that these changes are dominated by the change in the redshift of recombination due to the shift in the binding energy of hydrogen. We estimate the accuracy with which the next generation of cosmic microwave background experiments might constrain any variation in the fine-structure constant at z of roughly 1000. We find that such experiments could potentially be sensitive to $|\Delta \alpha/\alpha| \sim 10^{-2} - 10^{-3}$.