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| Equilibrium Abundances in the |
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| Early
Universe |
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| • | A particle of
mass m at very high |
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| temperature
(total energy > rest mass |
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| energy). If interaction timescale < the |
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| age of the
universe then stat mech gives |
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| the
equilibrium number densities of |
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| particle/antiparticle: |
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| • | Where g is
stat weight, p is momentum, |
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| and + for
fermions, - for bosons. |
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