Re: simple equation for the radius of the universe

--- In [email protected], "Chip Atchison" <chip_atchison@...> wrote:
>
> 
> Hi,
> Is there a relativly simple equation for the radius of the universe 
> for the times before and after the inflationary period?
> 
> Why? 
> 
> Well I am looking at a logrithmic chart showing the radius of the 
> universe vs time, in the Standard Big Bang model vs a model 
> incorporating the inflatinary period. 
> 
> (http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html scan the index for inflationary 
> period.) The radis looks like it can be calulated by the basic 
> y=mx+b formula . Unforutnaley, the chart is marked for simplicity 
> and I can't get the slope or constant off the chart.
> 
> thanks,
> 
> Chip
>

You can try R^2 = 2 / kp- where 2/k = 1.08E27, p = the average density of matter, I calculated it to be 1.2954E-17 but it could be more like 5E-30. In addition, k = 2.16E27, therefore R = 118280^2 or 13.99E9 light years. Good Luck!