ΛCDM with cold collisionless dark matter predicts that galaxies of similar halo mass should have broadly similar inner rotation curves reflecting a near-universal NFW-like density profile (Navarro 1997; Oman 2015). Observations reveal a wide diversity of rotation curve shapes at fixed mass — from slowly rising core-like profiles to steeply rising cusp-like ones — along with the Radial Acceleration Relation that ties rotation speeds tightly to baryonic distributions (McGaugh 2016).
The standard model assumes a universal NFW dark-matter halo profile shape with modest scatter. Recovering the observed diversity demands finely tuned baryonic feedback that produces both core and cusp profiles depending on host environment, which is hard to motivate from first principles. The RAR's tightness despite NFW diversity is a separate puzzle.
SCT replaces the hot-dense-center with a superluminal collision and the thermalized debris field. From this single change, what looks like a dark-matter halo is actually the constructive interference of comoving baryonic matter throughout the parent hierarchy: Φ_eff = Φ_local + Φ_mesh (P50, P51). The Φ_mesh contribution carries genuine environmental dependence: galaxies in cluster environments have different mesh contributions than galaxies in voids, producing the observed diversity in rotation-curve shapes naturally.
Angular-momentum inheritance (P31, P32) gives cascade-stream J/J_circ ratio diversity at galaxy formation: high-J inheritance produces extended disks with slowly rising rotation curves; low-J inheritance produces compact bulgy systems with steeply rising curves. Pre-existing matter from prior cycles (P25) gives gas-reservoir scatter that further modulates the rotation-curve shapes through the local baryon-density distribution. Combined, the diversity correlates with environment + cascade-stream history + inheritance, exactly the multi-axis correlation observed.
The Radial Acceleration Relation tightness emerges because g_dagger ≈ 1.2 × 10⁻¹⁰ m/s² is the characteristic scale where the Φ_mesh contribution becomes comparable to Φ_local, set by the parent-frame mesh structure (P52, P54). Galaxies follow the RAR because they all have the same coherent-mesh framework; the diversity in rotation-curve shapes comes from the variability in Φ_local plus the environmental modulation of Φ_mesh. The same M6 framework that produces flat rotation curves without invoking a CDM particle (P54) accounts for both the diversity and the RAR universality.
If precision SPARC + WALLABY + Square Kilometre Array rotation-curve surveys find galaxy rotation curve shapes uncorrelated with host environment at the 1% level (no Φ_mesh environmental signature), the M6 coherent-mesh diversity explanation is refuted. The signature SCT prediction is rotation-curve shape correlated with host-environment density and with cascade-stream J/J_circ ratio.