An important link was provided with this comment on primordial neutrinos in the Big Bang model.
From Big Bang to Present: Snapshots of Our Universe Through Time, "As the cosmos expanded, it cooled, and soon conditions were clement enough for quarks to come together into protons and neutrons. One second after the Big Bang, the universe's density dropped enough that neutrinos — the lightest and least-interacting fundamental particle — could fly forward without hitting anything, creating what's known as the
cosmic neutrino background, which scientists have yet to detect."
*Yet to detect* is a good and objective comment. Without the flood of primordial neutrinos created 1 second after the Big Bang, the Big Bang did not happen. There are many other interesting and exotic particles created in cosmology today as well during the period Planck time to 3 minutes or so after the Big Bang event. Inflatons used in inflation theory is an example.
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