The Angular Momentum Origin of Everything: Reconstructing the Foundation of Classical and Quantum Physics from Global Conservation Perspective

Based on the first principle of global zero-conservation of angular momentum, this paper establishes a bidirectional dynamic compensation mechanism between matter angular momentum and Medium angular momentum. Starting from this fundamental axiom, five core physical systems including Newtonian gravitation formula, Lorentz spacetime transformation, Maxwell electromagnetic field equations, Schrödinger equation and Dirac equation are derived top-down. By separating approximation conditions layer by layer, this paper systematically reveals the hierarchical progressive relationship among classical physics, special relativity, electromagnetism, non-relativistic quantum mechanics and relativistic quantum mechanics. The research proves that all discrete fundamental physical equations in modern physics are low-order local approximate solutions of global angular momentum conservation under different energy scales, densities, velocities and spacetime curvatures. All inherent theoretical defects such as singularity divergence, ultraviolet divergence, separation between macro and micro physics and failure under high energy conditions uniformly stem from the lack of Medium deformation compensation and high-order corrections for extreme physical fields. The multi-order high-order angular momentum correction system constructed in this paper realizes the homologous unification of macroscopic, electromagnetic, relativistic and quantum systems, and provides a brand-new self-consistent paradigm for the grand unification theory of fundamental physics.