Photons before the matter-energy decoupling 300,000 yrs

From: John Croft (
Date: Thu Jan 31 2002 - 00:38:59 GMT

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    Subject: Photons before the matter-energy decoupling 300,000 yrs
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    Dace wrote

    > >> >It's common knowledge among physicists,
    > >> >astronomers, cosmologists, etc., that light
    > >> >didn't appear until 300,00 years after
    > >> >the big bang (though I recently saw this figure
    > >> >upped to 400,000, unfortunately without any
    > >> >explanation for the revised figure).

    Dace, this is incorrect. The 300,000-400,000 date was
    that for te decoupling of matter and energy. Before
    that decoupling energy was more important than matter
    gravitationally. Scattering of light was such that
    clumps of matter were "dampened" and prevented from
    forming (a little like the dissipation of sound which
    dissipates "compression and rarefaction" of matter
    that propagates in a lineal fashion, before gravity
    can take effect). In fact light was present from the
    phase change of the electro-weak force into the
    weak-interaction and electro-magnetism. This occurred
    about 10^-12 seconds after the big bang, at about the
    time of the Quark Hadron confinement phase change.

    The Photon dominated Era began after 10^-10 seconds
    when temperatures fell below about 1 MeV (Million
    Electron Volts) as below that energy level
    annihilation between pairs of electrons and positrons
    exceeded pair creation. After that, the stage of
    nucleosynthesis added still more photons to the mix
    which finishes up with innumerably more photons per

    Hope this helps



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