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Photon decoupling is closely related to recombination, which occurred about 378,000 years after the Big Bang (at a redshift of z = 1100), when the universe was a hot opaque ("foggy") plasma. During recombination, free electrons became bound to protons (hydrogen nuclei) to form neutral hydrogen atoms .
About 370,000 years after the Big Bang, two connected events occurred: the ending of recombination and photon decoupling. Recombination describes the ionized particles combining to form the first neutral atoms, and decoupling refers to the photons released ("decoupled") as the newly formed atoms settle into more stable energy states.
After most of the leptons and antileptons had annihilated each other at the end of the Lepton Epoch, the energy of the universe is dominated by photons, which continue to interact frequently with the charged protons, electrons and nuclei. Recombination/Decoupling, from 240,000 to 300,000 years:
Oct 20, 2022 · 10-43 to 10-35 second after the Big Bang: Even within this tiny span, known as the Grand Unified Theory (GUT) Era, major changes take place. The most important event: Gravity becomes its own distinct force, separate from everything else.
Neutrino decoupling took place approximately one second after the Big Bang, when the temperature of the universe was approximately 10 billion kelvin, or 1 MeV. [3]
Mar 1, 2019 · One second after the Big Bang 13.8 billion years ago an abundance of invisible subatomic particles was released from the hot plasma that filled the universe, forming what scientists call the cosmic neutrino background.
10 -33 Seconds. Although the exact duration of the “Inflationary Period” is still unknown, scientists often use 10 —33 Seconds as one of the typical examples. This length of time is so short, more of them can fit in one second than the number of seconds since the Big Bang.
