宇宙光深[Cosmological Optical Depth] - 达人(其实～我是卧底，来自外星)

2004/10/17 | 宇宙光深[Cosmological Optical Depth]
类别(Ω〖物理〗) | 评论(0) | 阅读(32) | 发表于 10:54: If the universe has consists of protons and electrons. If the universe were homogeneous, fully ionized, and contained no He, the optical depth due to Thomson scattering along the line of sight to relativistic redshift is
(1)

where is the Thomson cross section. The proper length is
(2)

Now, since the electrons have constant co-moving density,
(3)

so

(4)

If , then this simplifies to
(5); 0