N3 — No dark matter particle

N3: Prediction

The Sector Exhaustion Theorem (Chapter (ch:book5-ch44-sector-exhaustion)) forbids a sixth sector. No dark matter particle—WIMP, axion, sterile neutrino, or any other species—will be detected in any experiment. $τ$-value: zero cross-section. Orthodox: $σ ∼ 10^-47$ cm$^2$ (WIMP). Experiment: LZ, XLZD, PandaX, XENONnT, DARWIN, ADMX. Timeline: 2025–2035.

Derivation Context

The number of fermion generations equals the rank of the first integer homology of the $τ^3$ fibration:

The result $|gen| = 3$ is established by three independent arguments, each drawing on different mathematical structures:

• $H_1$ rank = $(τ^3)$ (Theorem (thm:ch60-three-gen-rank)). The first homology group of $τ^3$ has rank 3 by the K"unneth computation (eq:ch60-kunneth). This is the most direct proof: the topological structure of $τ^3$ forces exactly three independent one-cycles.

The fiber $T^2 = (R · S^1) × (ι_τ R · S^1)$ with aspect ratio $r/R = ι_τ$ carries a Laplacian whose primitive eigenvalue spectrum (modes $(n,m)$ with $(n,m) = 1$) supports exactly three stable generation modes below the first composite-mode threshold: $λ_(1,0) = 1$, $λ_(0,1) = ι_τ^-2 ≈ 8.585$, $λ_(1,1) = 1 + ι_τ^-2 ≈ 9.585$. The next primitive mode $(2,1)$ has $λ_(2,1) ≈ 12.58$, exceeding the composite threshold $λ_(2,0) = 4$. No fourth light generation exists. (Registry: IV.T172, Wave 7.)