论文标题
限制了附近阳光恒星光谱的精细结构常数变化的限制
A limit on variations in the fine-structure constant from spectra of nearby Sun-like stars
论文作者
论文摘要
$α$的精细结构常数设定了电磁力的强度。粒子物理学的标准模型没有对其值的解释，这可能会有所不同。恒星吸收线的波长取决于$α$，但由于恒星大气中的天体物理过程而受到系统影响。我们使用17颗恒星测量了精确的线波长，被选为与太阳（太阳能双胞胎）几乎相同的大气特性，从而降低了这些系统效应。我们发现，$α$在$ \ lyssim $ 50 $ 50零件$ 50（ppb）中，距离地球50 parsecs。将所有17颗恒星的结果结合起来，提供了经验的局部参考，用于$α$的恒星测量以及12 ppb的合奏精度。
The fine structure constant, $α$, sets the strength of the electromagnetic force. The Standard Model of particle physics provides no explanation for its value, which could potentially vary. The wavelengths of stellar absorption lines depend on $α$, but are subject to systematic effects owing to astrophysical processes in stellar atmospheres. We measured precise line wavelengths using 17 stars, selected to have almost identical atmospheric properties to those of the Sun (solar twins), which reduces those systematic effects. We found that $α$ varies by $\lesssim$50 parts-per-billion (ppb) within 50 parsecs from Earth. Combining the results from all 17 stars provides an empirical, local reference for stellar measurements of $α$ with an ensemble precision of 12 ppb.
