Describe transformation of radiation into matter which followed big bang

Question

describe transformation of radiation into matter which followed big bang

Answer 1

I wonder if you realise quite how difficult this question is.  Radiation can be converted into equal numbers of particles and antiparticles, yet the big bang left us with a preponderance of matter over antimatter.  How this "symmetry breaking" could have come about is an interesting question in deep-level theoretical physics.

Answer 2

Sure, no sweat, HAHAHA

The current model has it that at about 10e-6 seconds after the big bang the expansion cooled to about 10e13 Kelvin, collision energies dropped to about 1 GeV, and quarks could start forming individual protons and neutrons. At this time, all particles that are part of the present universe were in existence, although the temperature was too high for the formation of nuclei.

Here are descriptions of a couple of conjectured chronologies:

http://hyperphysics.phy-astr.gsu.edu/Hba...

http://en.wikipedia.org/wiki/Timeline_of...