论文标题
不同的细微结构恒定宇宙学
Varying fine-structure constant cosmography
论文作者
论文摘要
宇宙学是一种现象学和相对与模型的宇宙学方法，在宇宙红移或相关变量中，物理量扩展为泰勒系列。在这里，我们应用这种方法来限制精细结构常数的宇宙学变化，$α$。这种情况的两个特殊性是存在高红移数据，而该系列中的一个术语通过原子钟的本地实验室测试直接而严格地限制了这一事实。 We use this atomic clock data, together with direct model-independent high-resolution astrophysical spectroscopy measurements of $α$ up to redshift $z\sim7$ and additional model-dependent constraints on $α$ from the cosmic microwave background and big bang nucleosynthesis, to place stringent (parts per million level) constraints on the first two terms in the $α$ cosmographic series.
Cosmography is a phenomenological and relatively model-independent approach to cosmology, where physical quantities are expanded as a Taylor series in the cosmological redshift, or in related variables. Here we apply this methodology to constrain possible cosmological variations of the fine-structure constant, $α$. Two peculiarities of this case are the existence of high-redshift data, and the fact that one term in the series is directly and tightly constraint by local laboratory tests with atomic clocks. We use this atomic clock data, together with direct model-independent high-resolution astrophysical spectroscopy measurements of $α$ up to redshift $z\sim7$ and additional model-dependent constraints on $α$ from the cosmic microwave background and big bang nucleosynthesis, to place stringent (parts per million level) constraints on the first two terms in the $α$ cosmographic series.
