Breaking the fundamental assumption of classical physics that regards vacuum as a constant and flat background, the Real-Virtual Dual Field Theory defines cosmic vacuum as a dynamical and attenuable virtual field medium. All fundamental interactions in the universe originate from the coupling, attenuation, topological constraint and intrinsic field resistance effect between real matter fields and virtual field medium. The theory is built on three core axioms: 1.A global virtual field medium pervades the cosmic vacuum, and its density follows the conjugate golden exponential decay law with spatial distance. 2.There exists scale-dependent intrinsic field resistance in space, whose magnitude varies dynamically with distance. 3.The four fundamental forces are not independent of one another, but different emergent forms of a single unified field at diverse spatial scales. Based on the above axioms, this paper constructs a universal Lagrangian. Via first-principles variational derivation, the four fundamental forces including gravity, electromagnetic force, strong nuclear force and weak nuclear force are fully unified.
zhongqiang Liu (Mon,) studied this question.