论文标题
在膨胀宇宙的光度 - 角距离关系上
On the luminosity-angular distances relation for an expanding universe
论文作者
论文摘要
扩展宇宙的光度 - 角距离关系由$ d_l = d_a（1+z）^2 $给出。从源头的角度来看，这种关系通常通过几何考虑来证明，假设宇宙不断扩展。在本说明中，相同的宇宙关系是从假定扩展宇宙的观察者的角度得出的。
The luminosity-angular distance relation for an expanding universe is given by $D_L=D_A(1+z)^2$. This relation is commonly proven by geometrical considerations from the source point of view assuming an expanding universe. In this note, the same cosmological relation is derived from the observer point of view for the assumed expanding universe.
