Unified Flow–Coherence Theory (UFCT): From Cosmic Flow to Galactic Structure

Unified Flow–Coherence Theory (UFCT) presents a first-principles framework in which gravity, galactic structure, and the Scalar Coherence field (Q) emerge from a single cosmic flow description. The work derives the coherence field from flow dynamics, introduces the Buoyancy Law as a structural stability criterion, and provides a unified interpretation of galaxy rotation curves, halo phenomenology, and gravitational collapse. The framework is formulated using universal theory constants constrained by established physical limits rather than galaxy-specific fitting parameters. Observational consistency is evaluated using published galaxy samples (SPARC, THINGS, LITTLE THINGS, and WALLABY) together with preliminary galaxy-cluster analyses. The paper also presents independent structural consistency tests and outlines several falsifiable predictions, including weak-lensing measurements, environmental structural trends, and black-hole observations. UFCT is proposed as a testable theoretical framework whose validity ultimately depends on future observational verification.