The observable universe contains matter but almost no antimatter. The ratio of baryons to photons is approximately 6×10⁻¹⁰ — a tiny excess of matter over antimatter that survived the early universe's annihilation. Standard physics requires CP violation and departure from thermal equilibrium to generate this asymmetry (Sakharov conditions), but cannot derive its magnitude. Pentagon Physics derives the baryon asymmetry from the φ-partition of unity: 1 = φ⁻¹ + φ⁻². The asymmetry between the escape fraction (1/φ) and the capture fraction (1/φ²) at the moment of self-referential closure is the source of matter-antimatter asymmetry.