Astronomy & Space Science · AST-693
Matter–Antimatter Asymmetry & Baryogenesis: Physical Mechanisms
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Mechanism
Mechanism of Matter–Antimatter Asymmetry & Baryogenesis
If reactions in the early universe violated baryon number and CP symmetry while occurring out of equilibrium, slightly more baryons than antibaryons could survive. After mutual annihilation, the small excess would become essentially all ordinary matter seen today.
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- 01The Big Bang — SummaryOpen source ↗
OpenStax Astronomy 2e · Mar 9, 2022
View claim-by-claim traceability3 verified claims
If reactions in the early universe violated baryon number and CP symmetry while occurring out of equilibrium, slightly more baryons than antibaryons could survive.
supported · checked Sep 22, 2026The observable universe contains far more matter than antimatter, even though known microscopic laws often treat matter and antimatter nearly symmetrically.
supported · checked Sep 22, 2026Laboratory experiments observe CP violation in some particle systems, but known Standard Model effects appear insufficient to explain the cosmic asymmetry.
supported · checked Sep 22, 2026