Three Pillars of DCD Theory: Hard Boundary Rebound, Scale Duality, and Asymmetric Evolution – The Complete Dynamical Foundation of Cosmic Evolution

Diffusion-Cohesion Dynamics (DCD) theory has successfully described crossscale evolutionary phenomena from quantum decoherence to civilizational transitions, and has established the Critical Coupling Law and the Information-Energy Density Conservation and Transformation Law 1-8. However, three fundamental questions remain incompletely answered: How does a system behave when approaching physical limits? What geometric relation exists between internal efficiency improvement and external manipulable range? Why does each reorganization yield permanent net gains? This paper addresses these questions by proposing three new principles—the Hard Boundary Rebound Law, the Scale Duality Principle, and the Asymmetric Evolution Principle. The Hard Boundary Rebound Law introduces absolute limits set by the Planck density and the cosmic horizon, mandating forced reorganization when extremes are approached; the Scale Duality Principle reveals that the internal characteristic scale L and the external manipulable scale R satisfy L 2R = constant,linking microscopic compression with macroscopic expansion; the Asymmetric Evolution Principle shows that temporal and scale asymmetries lead to a non-zero closed-path integral of the coupling strength, which is the ultimate source of net gain. Together, these three principles constitute the complete dynamical foundation of DCD theory, unifying diverse phenomena from black hole evaporation to civilizational leaps, and providing precise engineering blueprints for designing never stagnant adaptive chips.