The first three minutes

We will go from t = 0.01 s to t = 106 years. Of particular interest is the formation of the first nuclei. First we need

The first three concepts

So what happened?

The story is worked out by starting with The surprising fact one learns from this is that there are a lot more photons than protons.

(number of photons)/(number of protons) ~ 109

This tells us that in the early universe there were lots of photons for every proton.

From this information, one works backwards in time. We will start in the middle and work forward.

Davison E. Soper, Institute of Theoretical Science, University of Oregon, Eugene OR 97403 USA