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The Standard Model can incorporate baryogenesis, though the amount of net baryons (and leptons) thus created may not be sufficient to account for the present baryon asymmetry. There is a required one excess quark per billion quark-antiquark pairs in the early universe in order to provide all the observed matter in the universe. [3]
The Affleck–Dine mechanism (AD mechanism) is a postulated mechanism for explaining baryogenesis during the primordial Universe immediately following the Big Bang.Thus, the AD mechanism may explain the asymmetry between matter and antimatter in the current Universe.
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Such non-conservation of baryon number is indeed assumed to have happened in the early universe, and is known as baryogenesis. However, in some theoretical models, it is suggested that leptogenesis also occurred prior to baryogenesis; thus the term leptogenesis is often used to imply the non-conservation of leptons without corresponding non ...
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