Abstract Based on the core axiom system and primal field potential formula of Real-Virtual Dual Field Theory (RVDT), this paper introduces the dual field strength vector and a complete gradient-divergence-curl differential dynamic framework, constructs a global unified Lagrangian and derives it through first-principle variation, achieving for the first time the complete unification of gravity, electromagnetism, strong nuclear force and weak nuclear force under a single underlying ontological and mathematical framework. Taking the Origin Field () as the sole ontological substrate of the universe, the theory reconstructs the laws of cosmic evolution, force dynamics and mass-energy transformation by relying on its inherent virtual-real duality and the Conjugate Golden Decay Law. The theory requires no extra dimensions, unknown particles or supersymmetry hypotheses. The steady-state 95:5 distribution of virtual and real fields is fully consistent with the 2018 Planck satellite observations of cosmic composition. The derived RVDT version of Maxwell's equations with virtual field damping, modified gravitational field equations and nuclear force topological potentials realize cross-scale unification from the microscopic nuclear scale, mesoscopic electromagnetic scale, macroscopic celestial scale to cosmological scale. The calculated values of the theory have an average relative error of less than 0.1% compared with actual observations in fields such as cosmic microwave background radiation, galaxy rotation curves, lunar orbital perturbations and electromagnetic propagation damping. The theory also puts forward clear falsifiable predictions, meeting the basic requirements of scientific methodology. Keywords: Real-Virtual Dual Field Theory; Origin Field Ontology; Conjugate Golden Decay Law; Unified Field Theory; Unification of Four Fundamental Forces; RVDT Maxwell's Equations; Origin Field Resistance; Dark Energy
zhongqiang Liu (Fri,) studied this question.