Mass and Masslessness as Structural Features of Event-Density Theory

Working inside the Event‑Density (ED) framework, we show that mass is not a primitive ingredient of reality but a structural shadow cast by deeper informational constraints. ED forces a unique, bandwidth‑based notion of “mass signature” that cleanly distinguishes massive from massless entities without ever inserting a mass parameter by hand. It also predicts—on structural grounds alone—that at least one gauge‑type particle must be massless, marking ED’s first genuine “this kind of particle must exist” result. At the same time, ED refuses to play the numerology game: no mass ratios, hierarchies, or generation patterns follow from its primitives. Those remain empirical. The upshot is a sharp philosophical distinction: ED explains why mass is the kind of thing it is, but not how much of it any particle has. Mass is structural; values are contingent. This reframes long‑standing puzzles like the hierarchy problem and the flavor problem, not by solving them, but by showing why they were never structural puzzles to begin with.