Beyond Static Geometry: A Dynamic Vacuum and Pressure Gradient Model of Spacetime

This paper extends the Dynamic Vacuum Theory to cosmological scales by introducing the Galactic Pressure Law (GPL). Traditional astrophysics relies on undetectable dark matter to explain anomalous galactic rotation curves and large-scale structures. In contrast, this study proposes a strictly mechanical and hydrodynamic solution: gravity and galactic kinematics are driven by vacuum pressure gradients rather than static space-time geometry. Massive bodies create "pressure wells" within the dynamic vacuum substrate, treating galactic motion as a fluid dynamics phenomenon. By modeling the universe as a mechanical system governed by pressure equilibrium, the GPL offers a novel, unified framework that bridges cosmic-scale interactions with underlying quantum vacuum dynamics, eliminating the theoretical necessity for dark matter.