Macroscopic Motion and Spacetime Generation Mechanism without Presupposition of Gravity

This study attempts to establish a theoretical framework without the presupposition of gravity to explore the generation mechanism of spacetime and macroscopic motion. Based on the fundamental excitation forms of different quantum fields, field excitations such as massive objects and electromagnetic waves exist independently and together constitute the basic entities of the physical world. Spacetime is not a pre‑existing fixed background, but a state formed by the excitations of quantum fields. Gravity is not introduced as a fundamental interaction in this framework. Macroscopic motion phenomena originate from the dynamic coupling between different field configurations. This paper sorts out the basic postulates of the theory and constructs a logical chain at the ontological level. It also points out that further formal construction, numerical deduction and comparison with observations are required in follow‑up work. This exploration is an attempt of an alternative idea in fundamental physics, providing a different way of thinking for understanding the relationship among spacetime, matter and macroscopic motion.