N4 — Neutron EDM is exactly zero

N4: Prediction

$θ_ QCD = 0$ from SA-$i$ mod-3 (IV.T160), so $d_n = 0$ identically. Orthodox: $d_n 10^-26\,e\,$cm (axion-dependent). Experiment: nEDM, n2EDM at PSI. Timeline: 2025–2030.

Derivation Context

QFT’s structural problems have motivated decades of BSM physics: supersymmetry (to solve the hierarchy problem), extra Higgs doublets (to accommodate additional symmetry breaking), axions (to solve the strong CP problem), dark matter candidates (WIMPs, sterile neutrinos, gravitinos). None of these particles has been observed. Category $τ$ requires none of them. The hierarchy problem is dissolved by the UV shield. Strong CP is solved by the SA-i mod-3 structure ($θ_QCD = 0$ exactly; Registry IV.T160). Dark matter is dissolved by the Sector Exhaustion Theorem. The particle content of the $1$ readout is precisely the Standard Model—nothing more, nothing less.

A useful metaphor: the quantum field $φ(x)$ is scaffolding. It is erected during construction (the calculation), it supports the structure while the building rises (the perturbative expansion), and it is removed when the building is complete (the physical prediction). The scaffolding is not part of the building. Similarly, the quantum field is not part of the ontic structure. It is a computational device that organizes the readout, and when the readout is obtained, the field can be discarded. The structural content lives on the boundary, not in the bulk.