Fermionic Matter and Chirality from Projective Dirac Admissibility

Abstract

The preceding gauge–gravity synthesis of the Cosmochrony programme showed that gravity and Yang–Mills dynamics arise from the $a_2$ and $a_4$ Seeley–DeWitt responses of the same admissible spectral functional. The present paper extends this principle to the fermionic sector. Fermions are not introduced as external matter fields. They arise as the spinorial face of the Weil module already forced by non-injective admissibility, once its metaplectic Lie-algebraic structure is complexified by the Lorentzian metric established in the geometric branch of the programme. Three structural results are proved. First, the admissible Weil module $V_\rho$ induces, through its metaplectic lift and the Lorentzian complexification $\mathfrak{mp}(2,\mathbb{R})_{\mathbb{C}} \simeq \mathfrak{sl}_2(\mathbb{C})$, an admissible spinor bundle $S_\Pi$ whose symmetric and determinant tensor sectors reproduce the ${\operatorname{SU}}(2)_L \times U(1)_Y$ electroweak bundle structure. Second, the projected Dirac operator $\mathcal{D}_{\Pi,g,A}$ contains a canonical zero-order endomorphism $E_\Pi$, the internal spectral residue of non-injective projection. Under the spinorial lift of BI parity (Theorem thm:spinorial-bi-lift), $E_\Pi$ is left-admissible and produces the $V{-}A$ chiral structure. The $\gamma_5$-weighted $a_4$ coefficient of $\mathcal{D}_{\Pi,g,A}^2$ then imposes anomaly-cancellation trace constraints on the hypercharge weights, which are thereby not free parameters but spectral coherence data. Third, the admissible saturation invariant $\sigma_c(n_3) = 3$, a supplied selection rule (O23 proves the three-dimensionality of the neutral sector of a supplied spinor carrier; the carrier selection and the identification of $\Sigma_c$ with that dimension are open), admits a spinorial multiplicity reading, distinct from its geometric reading as three spatial directions, yielding conditionally a gauge-singlet three-generation factor $\mathbb{C}^3_{\mathrm{gen}} \subset \ker(\operatorname{ad}_{{\operatorname{SU}}(2)} \oplus Y)$. The colour-coupled quark sector is obtained by tensoring with the colour module $V_{\mathrm{color}}$, unconditional at the pointwise level ($[H\text{-color}]_{\mathrm{pointwise}}$ established in ). Finally, we identify a qualitative mechanism by which the oriented cascade lifts the static $J_\Pi$-protected degeneracy of the generation factor; the amplitude of this splitting remains deferred to the cascade normalisation.