Primordial Antimatter Collapse - A Gravitational Origin of the Matter Asymmetry

We propose that localized primordial antimatter over-densities, seeded by quantum fluctuations during inflation, could have collapsed gravitationally into primordial black holes (PBHs) before annihilation processes could erase them.This mechanism provides a natural, testable pathway for the survival of anti-matter without invoking new particles, forces, or extensions to the Standard Model.Once formed, these PBHs would be observationally indistinguishable from those arising from matter density peaks, contributing to the cosmic black hole population, seeding early supermassive black holes, and potentially accounting for part of the dark matter inventory.Subtle signatures, including modifications to the PBH mass function, impacts on cosmic microwave background anisotropies, and gravitational wave event rates, may offer observational access to this hidden antimatter legacy.This framework presents a minimalist, elegant solution linking inflationary physics, baryon asymmetry, and primordial black hole formation within established physical law.