The Cosmic Sorting Hat: Neutrino Chiral Steering as the Source of Cosmological Matter Asymmetry

The Standard Model of cosmology dictates that the Big Bang should have produced equal amounts of matter and antimatter, leading to total mutual annihilation. Existing models attempt to explain the observed dominance of matter through mathematical fine-tuning or late-stage spatial segregation during inflation. We propose an alternative conceptual framework—Chiral Steering—wherein the strict geometric handedness of neutrinos and antineutrinos acted as a fundamental spatial-temporal sorting mechanism at the Big Bang singularity. We argue that the matter universe, the CPT-symmetric antimatter mirror universe, and the relic cosmic neutrino background represent three distinct thermodynamic outcomes directed by neutrino helicity.