Spacetime Substantivalism 32: The Nature of the Graviton Revealed by Gravitational Wave Observations and the Grand Unification Reduction of Quantum Gravity—A Constitutive Audit 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 constants, demonstrating that the gravitational constant G is not an independent empirical parameter, but a stress compensation coefficient of the continuous medium field derived from electromagnetic constitutive parameters (₀, ₀) and the Planck scale. This ontological relocation of the graviton—identifying its physical manifestation as the constant G itself—effectively resolves the divergence issue in quantum gravity and achieves the theoretical closure of the Standard Model and general relativity within a unified substantial dynamics framework. 中文摘要: 自1926年现代量子力学建立及爱因斯坦构建广义相对论几何场方程以来, 国际理论物理界在“量子引力”领域长期面临概念与数学上的困境。其核心原因在于将引力类比为电磁力的离散粒子交换机制, 试图在平直背景上构建假设的自旋-2传播子 (“引力子”), 这导致了微扰展开中出现不可重整化的数学发散项。来自引力波的观测证据明确揭示: 引力波以光速传播并表现出连续波动力学特征, 直接否定了引力子作为离散粒子交换的假设, 并证实了时空作为具有电磁本构性质的“实质材料”的物理实在性。基于崔氏宇宙一元实体动力学 (CSSD) 框架, 本研究从物理维度与常数的基本定义出发, 论证了引力常数G并非独立的经验参数, 而是通过电磁本构参数 (₀, ₀) 及普朗克尺度导出的连续介质场应力补偿系数。这种对引力子本体论的重定位——即将其物理表现直接识别为常数G本身——有效地解决了量子引力中的发散问题, 并在统一的实体动力学框架内实现了标准模型与广义相对论的理论闭合。 主题词: 引力子;量子引力;引力波;构成性审计;宇宙一元实体动力学 (CSSD) ;时空本构基质;引力常数G;统一场论
Hugang Cui (Sat,) studied this question.