论文标题
宇宙光度 - 角距离关系的经验测量
Empirical measurement of cosmic luminosity-angular distance relation
论文作者
论文摘要
理解宇宙的关键之一是对光度距离$ d_l $和角直径距离$ d_a $之间关系的正确度量。 1933年，从一般相对论推导的Etherington互惠方程$ d_l = d_a（1+z）^γ$，$γ= 1 $用于本地（非扩展）宇宙。通过引入Comving距离的概念（$ d_m $），该关系已适应了一个扩展的宇宙，其值$γ= 2 $。在这项工作中，我们开发了方法\ textIt {宇宙红移推理}，以实验测量上面定义的$γ$的值独立于任何可能的星系进化。该方法已应用于120万个SDSS DR15的银河系，以获取$γ\ simeq 1 $的值。
One of the keys to understanding the universe is the proper measurement of the relation between the luminosity distance $d_L$ and the angular diameter distance $d_A$. In 1933 Etherington deduced from general relativity the reciprocity equation $d_L=d_A(1+z)^γ$, with $γ=1$ for a local (non-expanding) universe. This relation has been adapted to an expanding universe with the value $γ=2$ by the introduction of the concept of comoving distance ($d_M$). In this work, we developed the method \textit{Cosmic Redshift Inference} to measure experimentally the value of $γ$ defined above independently of any possible galaxy evolution. The method has been applied to 1.2 million galaxy of SDSS DR15 obtaining the value $γ\simeq 1$.
