Spacetime Substantivalism 32: The Truth of the Graviton Confirmed by Gravitational Waves and the Grand Unification Reduction of Quantum Gravity — The Constitutive Audit, the Physical Restoration of Tesla's Dynamic Theory, and the Closure of Monistic Substantial Spacetime Dynamics (CSSD)

Title Spacetime Substantivalism 32: The Truth of the Graviton Confirmed by Gravitational Waves and the Grand Unification Reduction of Quantum Gravity — The Constitutive Audit, the Physical Restoration of Tesla's Dynamic Theory, and the Closure of Monistic Substantial Spacetime Dynamics (CSSD) Abstract Since the establishment of modern quantum mechanics in 1926 and Einstein's formulation of the geometric field equations of general relativity, the international theoretical physics community has long faced conceptual and mathematical difficulties in the domain of "quantum gravity." The core reason lies in analogizing gravity to the discrete particle exchange mechanism of the electromagnetic force, attempting to construct a hypothetical spin-2 propagator (the "graviton") on a flat background, which leads to non-renormalizable mathematical divergence terms in perturbative expansions. Observational evidence from gravitational waves has clearly revealed: gravitational waves propagate at the speed of light and exhibit continuous wave dynamics, directly negating the hypothesis of the graviton as a discrete particle exchange, and confirming the physical reality of spacetime as a "substantial material" possessing electromagnetic constitutive properties. Based on the framework of Cui's Substantial Spacetime Dynamics (CSSD), this study starts from the basic definitions of physical dimensions and cosmic constitution, introduces the Planck action quantum ħ into the core structure of general relativity, and derives a monistic continuous medium quantum gravitational field equation — the Unified Constitutive Field Equation. This equation demonstrates that gravitational, electromagnetic, and quantum phenomena are essentially manifestations of the stress state of the spacetime electromagnetic photonic material at different energy levels. This study eliminates the renormalization divergence problem, accomplishes a thorough reduction of physical laws from phenomenological description to electromagnetic constitutive code audit, and completes the physical restoration of Tesla's dynamic theory of gravity. Keywords CSSD framework; substantial spacetime dynamics; electromagnetic matrix; unified constitutive field equation; graviton; gravitational waves; Nikola Tesla; Albert Einstein; dynamic theory of gravity; ontological reduction; ether; Michelson-Morley experiment; Planck scale; Bohr radius; Poisson equation; Newtonian gravity 标题 时空实体论32:引力波证实的引力子真相与量子引力的大统一还原—————构成性审计、特斯拉动力理论的物理归位与宇宙一元实体动力学(CSSD)