A symmetry-extension construction of an anomalous 4d Z_{N_c}-gauge TQFT cancels the SM mixed anomaly and selects N_c = N_f = 3 as the unique odd-color solution.
Implications of Anomaly Constraints in the $N_c$-Extended Standard Model
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abstract
We discuss some implications of anomaly cancellation in the standard model with (i) the color group extended to $SU(N_c)$, and (ii) the leptonic sector extended to allow right-handed components for neutrinos.
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hep-th 1years
2026 1verdicts
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Fermion Families and Pontryagin Class: Topological Field Theory via Colour Symmetry Extension
A symmetry-extension construction of an anomalous 4d Z_{N_c}-gauge TQFT cancels the SM mixed anomaly and selects N_c = N_f = 3 as the unique odd-color solution.