| Synthesis
of Light Elements |
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| • | Kolb &
Turner (1990) provide an analytic |
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| relation for
the 4He abundance as a |
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| function of
baryon-to-photon ratio η, Chi, |
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| and neutron
half life tau_1/2: |
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| • | Relatively
insensitive to present baryon |
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| density, in
contrast to other light |
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| elements. |
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