Interface-Induced Baryon Asymmetry from Non-Adiabatic Phase Generation

We propose a minimal scaling framework in which the observed baryon asymmetry of the universe arises from interface-induced non-equilibrium dynamics within the Interface Precipitation Cosmology (IPC) framework. The baryon asymmetry scales as η_B ~ exp(-f)/f × ε_CP, where f ≈ 5.457 is the dimensionless interface parameter established in Volume III (DOI: 10.5281/zenodo.20040358). CP violation naturally scales as ε_CP ~ O(1) × α_EM^3 due to electromagnetic scattering at the expanding interface. A key result is that the ratio of electromagnetic relaxation time to interface crossing time satisfies τ_rel/τ_int ~ 1/(f α_EM) ≈ 25 >> 1, placing the transition in a deeply non-adiabatic regime. In this limit, the Kibble-Zurek mechanism predicts an effective phase difference δ_eff ~ O(1), leading to sin δ ~ O(1) without free parameters. The resulting estimate η_B ~ 2 exp(-f) α_EM^3 / f ≈ 6.08 × 10⁻¹⁰ is consistent with the Planck 2018 observed value. The result should be interpreted as a scaling relation rather than a precise prediction. This is Volume IV of the IPU (Interface Precipitation Universe) series. Related works: - Volume III (Two-Constant Framework): 10.5281/zenodo.20040358 - Volume II (Void Scale, Chapter X): 10.5281/zenodo.19883101 - IPU 8.0 + SGWB: 10.5281/zenodo.19427118