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# 23: Overview of Thermal History


** under construction **

We should have a graphic here with time on the top axis and scale factor on the bottom axis, and mass density on the y axis. Label epochs such as double Compton freeze-out, e-/e+ annihilation, quark-hadron phase transition, weak interaction freeze-out, BBN, matter-radiation equality, and recombination. Maybe we stop a little ways after recombination.

We could have three such graphics, one with speculative very early-universe stuff (starting with inflation and reheating), one from quark-hadron phase transition to recombination, and one from first stars and quasars to present day.

This page titled 23: Overview of Thermal History is shared under a CC BY 4.0 license and was authored, remixed, and/or curated by Lloyd Knox.