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  1. Copilot Answer
    Overview

    Immediately after the Big Bang, the universe was a hot, dense plasma of photons, leptons, and quarks: the quark epoch. At 10 seconds, the Universe had expanded and cooled sufficiently to allow for the formation of … See more

    Recombination time frames

    The time frame for recombination can be estimated from the time dependence of the temperature of the cosmic microwave background (CMB). The microwave background is a blackbody spectrum representin… See more

    Recombination history of hydrogen

    The cosmic ionization history is generally described in terms of the free electron fraction xe as a function of redshift. It is the ratio of the abundance of free electrons to the total abundance of hydrogen (both neutral an… See more

    Primordial helium recombination

    Helium nuclei are produced during Big Bang nucleosynthesis, and make up about 24% of the total mass of baryonic matter. The ionization energy of helium is larger than that of hydrogen and it therefore recombine… See more

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