论文标题
精细结构常数130亿年前的四个直接测量
Four direct measurements of the fine-structure constant 13 billion years ago
论文作者
论文摘要
红移Z = 7.085的观测值已被用于在5.5至7.1的红移范围内搜索精细结构常数Alpha的变化。 Z = 7.1的观察结果只有8亿年的历史，探测了宇宙的物理学。这些是迄今为止alpha的最遥远的直接测量值，也是近红外光谱仪进行的首次测量。已经采用了一种新的AI分析方法。来自欧洲南部天文台非常大的望远镜（VLT）的X射击光谱仪的四个测量直接限制了Alpha的任何变化，相对于地球上测得的值（Alpha_0）。在宇宙中此位置的这个红移范围内电磁力的加权平均强度为da/a =（alpha_z-alpha_0）/alpha_0 =（-2.18 +/- 7.27）x 10^{ - 5}，即，我们没有发现与4个新的高度高红色的临时变化。当将4个新测量与较低的红移测量的大量样本相结合时，在3.7 Sigma级别上，对DA/A的可能空间变化的新限制略有优先。
Observations of the redshift z=7.085 quasar J1120+0641 have been used to search for variations of the fine structure constant, alpha, over the redshift range 5.5 to 7.1. Observations at z=7.1 probe the physics of the universe when it was only 0.8 billion years old. These are the most distant direct measurements of alpha to date and the first measurements made with a near-IR spectrograph. A new AI analysis method has been employed. Four measurements from the X-SHOOTER spectrograph on the European Southern Observatory's Very Large Telescope (VLT) directly constrain any changes in alpha relative to the value measured on Earth (alpha_0). The weighted mean strength of the electromagnetic force over this redshift range in this location in the universe is da/a = (alpha_z - alpha_0)/alpha_0 = (-2.18 +/- 7.27) X 10^{-5}, i.e. we find no evidence for a temporal change from the 4 new very high redshift measurements. When the 4 new measurements are combined with a large existing sample of lower redshift measurements, a new limit on possible spatial variation of da/a is marginally preferred over a no-variation model at the 3.7 sigma level.
