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Astronomy and Cosmology
Cosmology
Microwave background radiation - temperature at recombination
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[QUOTE="timmdeeg, post: 6850551, member: 73467"] Thank you very much for this very informative and trustworthy reference. So the conclusion is: [I]Using [B]equilibrium theory[/B], which is an oversimplification, gives the following fractions of neutral hydrogen for three different temperatures[/I] [LIST] [*][I][I]At T=3000K the Universe would have been more than 99% neutral[/I][/I] [*][I][I]At T=4000K the Universe would have been about 40% neutral[/I][/I] [*][I][I]At T=3800K the Universe would have been about 70% neutral[/I][/I] [/LIST] [I]Using a more correct 3-level model developed by Peebles and, independently, by Zel’dovich, gives that the Universe would have been about 90% neutral by the time the temperature had dropped to T=3000K. It is this temperature which is usually quoted when we talk about the temperature of the Universe when recombination (decoupling) occurred.[/I] This matches very well the observed redshift z = 1100. [/QUOTE]
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Astronomy and Cosmology
Cosmology
Microwave background radiation - temperature at recombination
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