Baryogenesis: The Matter–Antimatter Asymmetry (2D)

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, pannable and zoomable containment disc, 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.