2004/11/19 | 真距离[Proper Distance]
类别(Ω〖物理〗) | 评论(0) | 阅读(29) | 发表于 13:23
The cosmological proper distance is given by
(1)

where a is the expansion parameter, r is the radius of the region in question, and c is the speed of light. From the Robertson-Walker line element,
(2)


(3)

where is the curvature of the universe.
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