Event Density as a Physical Ontology: From Primitives to Dynamics to Empirical Predictions

Event Density (ED) develops a constitutive ontology in which the fundamental primitive is the local rate of becoming — the density of micro‑events in spacetime. From four primitives and seven axioms, the framework yields a unique scalar dynamical equation whose three channels correspond exactly to familiar physical laws: nonlinear diffusion, exponential relaxation, and telegraph‑type oscillation. This paper tests this architecture across scales. In condensed matter, the predicted decline of diffusivity near saturation fits three chemically distinct systems with a common exponent near two, and the porous‑medium front‑propagation law is confirmed in simulation. At galactic scales, coupling the ED equation to Poisson gravity produces naturally cored halo profiles that match observed dwarf‑galaxy cores, while interpreting the global participation mode as a “temporal‑tension” field explains flat weak‑lensing velocities out to one megaparsec and reproduces the baryonic Tully–Fisher relation with the observed one‑quarter exponent. ED makes two sharp, discriminating predictions: activity‑dependent weak‑lensing velocities and a diffusive lensing lag in merging clusters. Neither is expected in MOND or in standard dark‑matter models. The framework does not replace existing physics; it shows that a minimal process‑based ontology can generate structural features of physical law across domains, making its empirical tests philosophically and scientifically significant.