Astronomy & Space Science · AST-694
Matter–Antimatter Asymmetry & Baryogenesis: Observation, Measurement & Evidence
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Evidence
Evidence for Matter–Antimatter Asymmetry & Baryogenesis
Laboratory experiments observe CP violation in some particle systems, but known Standard Model effects appear insufficient to explain the cosmic asymmetry. The measured baryon density from CMB and nucleosynthesis establishes the size of the surviving matter abundance.
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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