UD Theory in the Microscopic Low-Energy Regime: Consistency with QED

This paper demonstrates the consistency of UD theory with quantum electrodynamics (QED) in the microscopic low-energy regime. From the UD axioms, the fundamental mass scale is exactly m_0 = 1/(2πe^π) in natural units. In Planck units (M_P = 1), the dimensionless ratio is m_0/M_P = 1/(2πe^π) ≈ 0.00688, an exact consequence of the UD axioms. All four aspects U_U, U_D, D_D, D_U have masses determined by m_0, of order M_P. At energies E ≪ M_P, these heavy fields cannot be produced as real particles. They can only appear as virtual particles in loop diagrams, and their propagators are suppressed by 1/m_0^2 ~ 1/M_P^2. Integrating out the heavy fields from the UD action yields an effective Lagrangian at low energies: L_eff = L_QED + (c_5/M_P)O_5 + (c_6/M_P^2)O_6 + ... Taking the electron anomalous magnetic moment a_e = (g-2)/2 as an example, we compute the one-loop diagram with a heavy field exchanged between the electron and the photon. Using standard techniques and the UD constants, the correction satisfies the upper bound: δa_e^UD ≤ 3.54×10⁻²⁴. The current experimental precision is Δa_e^exp ≈ 2.8×10⁻¹³ (CODATA 2022). The UD correction is at most eleven orders of magnitude below experimental precision, completely unobservable. We also discuss other low-energy observables:- Lamb shift: UD correction ~ 10⁻¹¹ eV (precision ~ 10⁻⁶ eV)- Muon g-2: UD correction ≤ 7.31×10⁻²² (precision 4.6×10⁻¹⁰), cannot explain the 4.2σ discrepancy- High-energy colliders: E/M_P ~ 10⁻¹⁶, effects completely negligible This explains why QED has been so successful over the past seven decades: the fundamental scale of UD theory is the Planck scale, and all corrections are suppressed by powers of E/M_P. No deviation from QED is expected at currently accessible energies. The UD theory is fully consistent with all existing QED tests.