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| Equilibrium Abundances in the |
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| Early
Universe |
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| • | Example:
Protons and Neutrons in the |
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| early
Universe. At redshifts z < 1012, |
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| they are
non-relativistic and equilibrium |
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| abundances are
maintained by electron- |
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| neutrino weak
interactions: |
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| • | Same g values,
but a mass difference: |
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