Geometric Reaction: From Quantum Hydrodynamics to a Cross-Domain Generative Principle

Geometric Reaction (First Law). Geometry is the operative container; any difference within it induces a reaction that unfolds as tempo (time as rhythm of change) and residue (persistent form, including matter). The recursive cycle geometry → reaction → new geometry appears across physics, biology, engineering, and narrative. From an action in density and phase, the framework yields a continuity equation and a Hamilton–Jacobi equation with an added geometric information term; under standard conditions these recover the Schrödinger equation without assuming probability as fundamental. Randomness and infinity are treated as signals of incomplete mapping, not foundations. Universality is presented as a hypothesis, open to empirical and theoretical test. Preprint; not peer reviewed. Feedback and review are welcome.