Spacetime Substantivalism XII Constitutive Divergence between Null-Debt and Topologically Constrained Sectors in Effective Spacetime Field Theory (实体时空论第十二篇:有效时空场论中零债扇区与拓扑约束扇区的本构分歧)

We present an effective field-theoretic decomposition of spacetime excitations into two hierarchical sectors: a null-debt excitation sector (photonic degrees of freedom), and a topologically constrained sector (massive matter fields). We show that the invariant light-speed condition (T₀=0), the emergence of inertial mass, and the velocity bound ($v<c$), all arise from a unified phase-space saturation constraint in the spacetime constitutive lattice. Mass is interpreted as a topological obstruction to full excitation transfer, while black-hole formation corresponds to a breakdown of constitutive closure in the constrained sector. This framework remains fully consistent with relativistic quantum field theory in the infrared limit and provides a structural interpretation of Lorentz invariance as an emergent fixed point. Crucially, T₀=0 is derived as a dynamical saturation fixed point rather than a kinematic limit, correcting the misconception that "light experiences zero time." Keywords: Substantive Spacetime; Light-speed Constitution;null-debt excitation; topological constraint; phase-space saturation; emergent Lorentz invariance; black hole closure; CSSD Series 摘要: 本文提出了一种有效场论分解方法,将时空激发划分为两个层级:零债激发扇区(光子自由度)和拓扑约束扇区(有质量物质场)。我们证明了恒定光速条件(T₀=0)、惯性质量的出现以及速度限制($v<c$),均源于时空本构点阵中统一的相空间饱和约束。质量被解释为完全激发转移的拓扑障碍,而黑洞的形成则对应于约束扇区中本构闭合的失效。该框架在红外极限下与相对论量子场论完全一致,并将洛伦兹不变性结构性地阐释为一个涌现的不动点。至关重要的是,T₀=0 被推导为一个动力学饱和不动点而非运动学极限,从而纠正了“光不经历时间”的误解。 主题词: 实体时空;光速本构;零债激发;拓扑约束;相空间饱和;涌现洛伦兹不变性;黑洞闭合;CSSD系列