This paper presents Photon Theory V4.0, a self-consistent, complete, observationally consistent and strictly falsifiable framework in fundamental physics. The core conclusions are: Time is not the fourth dimension; the photon constitutes the physical ontology and carrier of the fourth dimension; and time is a macroscopic emergent quantity generated by photon propagation along the cosmic optical axis. This framework does not contradict any experimentally confirmed phenomena, provides a unified explanation for the invariance of the speed of light, spacetime geometry, cosmic evolution, relativistic effects and quantum behavior, and forms a logically closed system.
Zhenmin Wang (Sun,) studied this question.
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