B Age of the Universe at the recombination?

[mbond]

The age of the universe at the recombination is reported everywhere on the internet as 379,000 years.
I would be grateful if someone could point me towards the paper where this is calculated.

 

[HallsofIvy]

What is this "recombination"? What was recombined?

 

[Mordred]

The epoch when neutral atoms start to reform. It is a preliminary stage to the surface of last scattering

One can find the details here
www.astro.utoronto.ca › E...PDF
Web results
Emberson Qualifier Solutions - Department of Astronomy ...

 

[Mordred]

http://www.astro.utoronto.ca/~cczhu/EmbersonQual.pdf&ved=2ahUKEwiA58SvxqPjAhWNwMQHHSQ0AzIQFjAAegQIAhAB&usg=AOvVaw2ObN_IA6lZhynuI8ifg24m

Sorry previous link is incorrect grr can't get the link correct on this phone. I will post later but simply Google " epoch of recombination pdf"

That will pull up several references

 

[phyzguy]

The age of the universe at the recombination is reported everywhere on the internet as 379,000 years.
I would be grateful if someone could point me towards the paper where this is calculated.

I think it would be more correct to say that this value has been measured. This is done by fitting a model, called the Lambda-CDM model to the measurements of the cosmic microwave background radiation. In the Wiki article this parameter is called t*. The most recent and accurate measurement of this parameter is from the Planck collaboration. You can read their paper at this link. Figure 1 on page 7 shows how well the model fits the data. The parameter z*, in Table 2 on page 15, basically gives this value, although you have to understand the model well enough to be able to convert from redshift to time to get the age. Do you have a working knowledge of modern cosmology? If not, you will probably not be able to follow the paper.

 

[Michael Price]

The epoch when neutral atoms start to reform.

Recombination and reformation is a bit misleading. This the time when neutral atoms first formed and the universe became transparent.

 

[Mordred]

Fair point should have stated recombine

 

[kimbyd]

As an aside, one interesting thing about recombination is that it took a fair amount of time to occur (roughly 10-15% of the age of the universe at that time). This fact is important for analysis of the cosmic microwave background (which was emitted during recombination), as it causes small-scale variations to be blurred.

 

[member 657093]

where this is calculated

Does your question mean how we got the age of the universe at recombination? If so, all you need is to integrate the parametrized Friedmann equation with the redshift of the recombination which is z = 1100. The integration will give you the age of the universe at that time(event).