2004/10/17 | 宇宙间隔[Cosmological Distance]
类别(Ω〖物理〗) | 评论(0) | 阅读(25) | 发表于 10:36
In the Einstein-de Sitter cosmological model,

so


From the Robertson-Walker line element with , and for a photon,






since , so

For a general cosmological model,
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