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Mainstream physics regards the vacuum speed of light c as an unsurpassable cosmic velocity limit, interprets E=mc² as the equivalence of mass and energy, and relies on the light speed limit to maintain causal order. This paper first sorts out the hierarchical distinctions among the Universal Universe, the 4D Mother Universe and Sub-universes, and points out a fundamental category error in conventional physical interpretations. Based on the PFUSRC biconic ontology, this study proposes that the speed of light c is not a universal velocity limit, but an intrinsic topological structural constant of the Gap Field (0-Interface) within the 4D Mother Universe, representing the maximum statistical average rate of discrete quantum point-to-point transitions. The mass-energy equation E=mc² is not an absolute universal law for mass-energy conversion, but a degenerate special case derived from PFUSRC dual-field dynamics under macroscopic low-velocity conditions. The directionality of causality is not governed by the speed of light, but originates from the ontological structure formed by the irreversibility of Ψ-Ξ anchoring and the unidirectional feature of biconic topology. This work fundamentally redefines and theoretically updates the connotations of the light speed limit, the mass-energy formula and cosmic causality.
Zhenmin Wang (Mon,) studied this question.