This paper proposes two complementary principles to explain flat galactic rotation curves without dark matter. Principle I (Gravitational Flux Area): The effective area Aₑff (r) through which gravitational flux propagates is determined by the geometry of the matter distribution, not universally equal to 4πr². For a thin galactic disk of scale height H, flux propagates cylindrically with Aₑff = 4πHr, yielding g ∝ 1/r and flat circular velocity without invoking dark matter. Principle II (Self-Reinforcing Feedback): Gravitational flux concentrates toward mass overdensities, drawing more matter in, which deepens the overdensity and further concentrates the flux. This feedback — analogous to water carving a river channel — drives matter into disk configurations that produce cylindrical flux geometry, and self-consistently maintains those configurations. Together, these principles explain: (1) flat rotation curves without dark matter; (2) the universal transition radius r₀ ~ √Mbulge separating Newtonian and flat-rotation regimes; (3) the Tully-Fisher relation v⁴ ∝ M as a geometric consequence; (4) the absence of dark matter signatures in globular clusters and the solar system; (5) galaxy alignment along cosmic filaments; (6) precocious massive galaxies observed by JWST. Newtonian gravity and General Relativity remain valid as local descriptions of gravitational intensity. The new framework constitutes a non-local layer describing the propagation structure within which those local laws operate. Dark matter is identified as the artifact of applying spherical flux propagation to systems governed by cylindrical flux geometry. This paper is an independent contribution and also represents a development of the author's earlier work on Bowl geometry (see related Zenodo deposits).
JongJin Ma (2026) studied this question.