Electroweak sin²θ_W → α_mf Quantum mech. ℏ²/(2m) Gen. relativity 4πG (Gauss) Cosmology ρ_DM Bridge equation f = 4π / (K√2) = 0.5666 0.18% match · zero free params α_mf → ξ_SC2 4πc² → SC2 ξ_CP from ρ_DM 1/√2 factor