膨胀宇宙的光度-角距离关系
On the luminosity-angular distances relation for an expanding universe
AI总结：
本研究针对膨胀宇宙的光度-角距离关系，从观测者视角推导了已有的$D_L=D_A(1+z)^2$宇宙学关系，补充了该关系的推导视角。
摘要：
膨胀宇宙的光度-角距离关系由$D_L=D_A(1+z)^2$给出。该关系通常在假设宇宙膨胀的前提下，从光源视角通过几何考量证明。本短讯针对所假设的膨胀宇宙，从观测者视角推导了这一相同的宇宙学关系。
英文摘要：
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.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
