The Hadron Epoch? New to this tour in physics? Start at THE BIG BANG.
You probably have heard about The Large Hadron Collider (LHC). The biggest instrument/machine on Earth are located at CERN. See image below. The accelerator smashes hadron’s together.
“Between 10–6 second and 1 second after the Big Bang.
In particle physics, a hadron is a composite particle made of quarks held together by the strong force (in a similar way as atoms and molecules are held together by the electromagnetic force).
In physical cosmology, the hadron epoch was the period in the evolution of the early universe during which the mass of the Universe was dominated by hadrons.
It started approximately 10−6 seconds after the Big Bang, when the temperature of the universe had fallen sufficiently to allow the quarks from the preceding quark epoch to bind together into hadrons.
Initially the temperature was high enough to allow the formation of hadron/anti-hadron pairs, which kept matter and anti-matter in thermal equilibrium.
However, as the temperature of the universe continued to fall, hadron/anti-hadron pairs were no longer produced.
Most of the hadrons and anti-hadrons were then eliminated in annihilation reactions, leaving a small residue of hadrons. The elimination of anti-hadrons was completed by one second after the Big Bang, when the following lepton epoch began.”
Take note, that after one second, the majority of anti-matter had disappeared from the physical universe.
Next lecture THE LEPTON EPOCH.