Phenomenological Model of Emergent Gravity

We propose a unifying framework in which physical reality emerges from three hierarchical domains: a Primordial Bubble (P) of axioms, a 10-dimensional Middle Bubble (M) hosting a primordial tensor field IBA(ξ), and a 4-dimensional Universe Bubble (U) obtained via holographic projection. A discrete Z₂ symmetry I→ -I forbids cubic instabilities, rendering the potential V(I)=12 m² Tr(I²)+λ[Tr(I²)]². In the low-energy limit, the linearised equations for I reduce to the Einstein equations for the metric perturbation δ gμν=V₆\,δ Iμν, with effective Newton constant Geff=(16π m² V₆)⁻¹. The six extra dimensions are stabilised by a combination of curvature, gradient energy, and a Freund-Rubin F₄ flux, yielding a radion mass m_φ≈ 1.65± 0.15\;TeV. We explicitly show why this radion mass has not been excluded by LHC data (ATLAS/CMS) due to its large width Γ_φ/m_φ ~ 0.3-0.5 and suppressed production cross section. The Standard Model gauge group and three fermion generations follow from an explicit orbifold T⁶/Z₃ construction, with a complete decomposition of the E₈ adjoint representation and the index theorem yielding Ngen=3. Specific predictions include a radion decay ratio Γ(φ→γγ)/Γ(φ→ gg)≈ 0.0053 and a gravitational decoherence rate Γg~ κ G m₀² c³/²(Δ x/LP)² with κ~ 10⁻². {abstract}