
In physical cosmology, baryogenesis is the generic term for hypothetical physical processes that produced an asymmetry between baryons and antibaryons in the very early universe, resulting in the substantial amounts of residual matter that make up the universe today. Baryogenesis theories (the most important being electroweak baryogenesis and GUT ...
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http://en.wikipedia.org/wiki/Baryogenesis

The creation of matter in excess of antimatter in the early universe. Only the relatively few unmatched matter particles survived to make up all subsequent structures. Related entry • Big Bang
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http://www.daviddarling.info/encyclopedia/B/baryogenesis.html
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