Chirality Inheritance in Antimatter: A Prediction from Bootstrap Universe Phase Coherence

The left-handedness of the weak force is one of the deepest unexplained asymmetries in physics. The Standard Model encodes it but provides no mechanism for its origin, and has not posed the question of whether antimatter inherits or reverses this chirality from first principles. Here we derive from the Bootstrap Universe framework that chirality is a property of the universal ground state, not of the particle-antiparticle distinction. The universe bootstrapped from a Grandi series starting at +1, with counter-clockwise first closure establishing a single left-handed chiral vacuum. Any particle created within this vacuum — including antiparticles — is an excitation of that vacuum and inherits its handedness. We formalise this via a rotating fluid analogy: no local creation event can produce a counter-rotating vortex without reversing the entire bulk fluid, which is kinematically forbidden at any finite energy. This mechanism extends Nambu's Nobel Prize-winning spontaneous symmetry breaking to cosmological scale. This yields a specific, falsifiable prediction: antihydrogen at CERN will exhibit left-handed weak coupling, not right-handed. This prediction is currently untested by any experiment. The ALPHA programme has measured CPT symmetry through spectroscopy but has not measured weak interaction chirality in antihydrogen. We identify the experimental observable — the parity asymmetry parameter A, predicted to match the matter value of −0.1184 rather than its mirror +0.1184 — and its discriminating power.