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| Decoupling of Neutrinos and the |
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| Neutrino
Barrier |
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| • | During these
early epochs, particles |
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| contributing
to the energy density are |
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| photons,
electrons, neutrinos, and |
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| antiparticles. Adding contributions: |
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| • | Where N_nu
refers to the number of |
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| neutrino
species. For 3, Chi = 43/8. |
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