Wednesday, 13 June 2018

cosmology - How long was the universe radiation dominated?


Using the Friedmann metric I've been trying to calculate how long the universe was radiation energy dominated. I've reduced the metric to:


$c.dt$ = $a(t).dr$


where a is the scale factor. I can work out the this since I know the redshift then was ~3000. But how do get rid of the dr and get an equation that relates $dt$ to $a(t)$ ?




No comments:

Post a Comment

Understanding Stagnation point in pitot fluid

What is stagnation point in fluid mechanics. At the open end of the pitot tube the velocity of the fluid becomes zero.But that should result...