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Introduction In the last 30 years we have made great progress both ...

Introduction In the last 30 years we have made great progress both ...

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We define abundance Y=N/s to remove H*N termTime evolution can be transformed into <strong>the</strong>rmal oneForNumerical estimationsUntil Yeq(T)* γ (T) >>1 <strong>we</strong> <strong>have</strong> chemical equilibrium Y(T)==Y eq (T)31

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