Photon Theory – Version B (Complete Proof) V3.2

This paper establishes a complete, self-consistent theoretical framework based on the four-dimensional conical (Pythagorean frustum) cosmic structure. It rigorously proves that the photon is the physical ontology of the fourth dimension of time and the unique central growth axis of cosmic expansion. The rest mass of the photon is zero under experimental precision, but it is a dynamic approximation rather than an absolute essence, since the photon can never be truly at rest. The condition that photon rest mass approaches zero is critical to avoiding cosmic explosion and maintaining stability. Cosmic expansion follows growth-dissipation equilibrium, with a weak positive surplus driving steady accelerated expansion, supported by the Hubble constant. Bosons and neutrinos can be interpreted as higher-dimensional geometric projections; quantum entanglement reflects topological unity in higher dimensions. The Pythagorean frustum is the theoretically optimal geometric structure for stable photon propagation and energy confinement. This framework is logically closed, compatible with relativity and observations, and free of contradictions.