We propose that the enhanced Higgs quartic coupling required by radiatively broken electroweak symmetry (RBEWS) emerges naturally from SO(10) grand unification. Our previous analysis demonstrated that a coupling enhancement factor k = λ e n h a n c e d / λ S M leads to absolute vacuum stability with a UV Landau pole near the GUT scale for k ≳ 1.03. The RBEWS prediction e 125 = 7.2 of Steele and Wang, when properly translated from the Coleman-Weinberg scheme at the electroweak VEV to the M S ‾ scheme at M t via scheme conversion and scale-dependent ratio evolution, yields k ( M t ) ≈ 6.0–6.4, corresponding to a UV pole at Λ UV ∼ 1.5–2 × 10 16 GeV—remarkably close to the GUT scale M GUT ∼ 2 × 10 16 GeV. We argue this coincidence is not accidental: the UV pole signals the scale where the Standard Model effective description must be embedded into the full SO(10) structure. We derive threshold corrections from SO(10) scalar sectors containing 10 H , 126 ‾ H , and 45 H representations, showing that portal couplings between the light Higgs doublet and heavy GUT scalars can generate enhancement factors of order k ∼ 5–10 at the matching scale. The Coleman-Weinberg mechanism operating within a classically scale-invariant GUT scalar potential provides a dynamical origin for both RBEWS and the hierarchy between M GUT and the electroweak scale. The properly translated enhancement k ( M t ) ≈ 6.0–6.4 predicts a trilinear coupling modifier κ λ consistent with the current ATLAS constraint κ λ < 6.6 at 95% CL from combined Run 2+3 H H → b b ¯ γ γ data, while offering a definitive test at the HL-LHC. Our framework further predicts correlations with proton decay rates and gravitational wave signatures from cosmic strings, providing multiple experimental probes of the unified scenario.
Farrukh Chishtie (Wed,) studied this question.