Effective Theory of Everything below 100 TeV Gravity, Flavour and Primordial Nucleosynthesis from a Single Geometric Scalar

We construct an effective field theory (EFT) in which Einstein gravity and the Standard Model (SM) are completed by a single geometric scalar field φ. The scalar degree of freedom is the same that drives the MMA–DMF cosmology, previously shown to account for late-time acceleration, an Early–X background, enhanced structure growth and a future turnaround without cold dark matter or a separate dark energy fluid. Here we extend the framework in three directions: (i) a geometric flavour sector where all fermion masses and mixings arise from Yukawa operators Yij(f)(ϕ)Y^{(f)}_{ij}(\phi)Yij(f)(ϕ); (ii) a dynamical flavour deformation of Big Bang Nucleosynthesis (BBN) that reconciles an Early–X bump in H(z) with the observed abundances of 4^44He, D/H and 7^77Li; and (iii) an EFT consistency analysis showing that the scalar is compatible with the SM gauge structure and perturbative unitarity up to a high cutoff Λ. The result is not a final “Theory of Everything”, but a concrete and data-compatible unified scalar EFT in which gravity, flavour and primordial nucleosynthesis are controlled by the same geometric field.