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Baryogenesis: The Matter–Antimatter Asymmetry

Watch the early universe cool: matter and antimatter pairs pop into existence and annihilate, but a small CP-violating asymmetry parameter η leaves a tiny surplus of matter behind — the leftover that became everything.

Space & Astronomy3DAdvanced60 FPS📱 Mobile-adapted

Every particle created in the hot early universe should have been matched by an antiparticle, and the two should have annihilated each other completely — leaving a universe of pure light and nothing else. This simulator recreates the three Sakharov conditions that explain why that didn't happen: particle/antiparticle pairs pop into a cooling volume, a CP-violation slider makes matter production ever so slightly more likely than antimatter production, and as the temperature drops the pair-production reaction switches off faster than annihilation can finish the job. Watch the counts, the live asymmetry readout, and the freeze-out phase indicator to see a small, permanent matter surplus lock in — the same mechanism believed responsible for every atom you're made of.

⚙ Under the hood

Watch matter and antimatter pairs form and annihilate as the early universe cools, while a CP-violating asymmetry parameter leaves behind the small permanent surplus of matter that became everything we see today.

cosmologyparticle-physicsbaryogenesisbig-bangCP-violationearly-universe

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install