2004/10/21 | 临界密度[Critical Density]
类别(Ω〖物理〗) | 评论(0) | 阅读(45) | 发表于 13:27
From the Einstein-de Sitter cosmological model, the critical density of the universe(the density required for the universe to be closed to that expansion stops asymptotically at infinite time) is

where H is the Hubble constant and G is the gravitational constant.
The quantity is defined as

so a closed universe satisfies .
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