2004/10/25 | 减速因子[Deceleration Parameter]
类别(Ω〖物理〗) | 评论(0) | 阅读(31) | 发表于 13:20
The parameter q defined by
(1)

(2)

(3)

where a is the expansion parameter,G is the gravitational constant, is the density P is the pressure,c is the speed of light,H is the Hubble constant, is the critical density, and
(4)

For a matter-dominated universe,
(5)

so
(6)

For a radiation dominated universe,
(7)

so
(8)
0

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