(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Show that by using the Friedmann-equation you can determine the scale factor for a Universe in it's early stages (starting with the Big Bang) to:

2. Relevant equations

The equation for the scale factor:

Where r(t) is the distance from us to a given galaxy to the time t and r0 is the galaxies current distance from us.

And the Friedmann equation:

3. The attempt at a solution

I'm dumbfounded and I have no idea of what to do. This is for a major paper and any help is much appreciated. If you don't understand the problem, please do say so and I'll try and clear it up. Thanks a lot!

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# Homework Help: Calculating the scale factor (cosmology) for a universe starting at the Big Bang

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