The Sva Framework – Ver. 1.9.5

General Relativity successfully describes gravity as the curvature of spacetime generated by energy and mass, yet it does not specify the physical substance of spacetime itself, nor does it account for the unseen mass inferred from galactic and cosmological observations. We propose that spacetime constitutes a continuous dark-matter density potential ρ(x,t), whose spatial gradients (∇ρ) generate gravitational acceleration and whose temporal variations (∂ρ/∂t) describe the flow of energy within the field. Small perturbations δρ propagate as gravitational waves satisfying ∂²δρ/∂t² − c²∇²δρ = 0. This Spacetime Dark-Matter Field Model (SDMF) unifies the geometric and material aspects of gravity into a single physical field, reproduces the Newtonian limit, and yields falsifiable predictions for galactic rotation, gravitational lensing, and large-scale structure formation.