Compiled, not illustrated

Why galaxies spin faster than they should.

Drag the sliders. The amber curve is the coherence model, recomputed in real time by Coherence Language compiled to WebAssembly, running in your browser. The black points are real measured rotation; the grey dashed line is what visible matter alone predicts. There is no chart library and no physics in JavaScript - the model is the lab's own language, computed bit-for-bit as it is on the server.

Galaxy

Stellar mass-to-light, disk (Υ_d) 0.50

Mass-to-light, bulge (Υ_b) 0.70

Acceleration scale g† (10⁻¹⁰ m/s²) 1.20

Observed (SPARC) Newtonian, baryons only Coherence model

Agreement with data: mean |V_obs−V_model|/σ = - · recompute time: -

Notice the mass sliders barely move the curve - that's the physics, not the instrument. The model makes rotation speed scale like the fourth root of the baryonic acceleration, so even doubling the stellar mass shifts the curve only about 10%. This near-indifference to the exact stellar mass is one of the most celebrated features of the theory: it is why a single universal law fits hundreds of galaxies whose masses are known only to within a factor of two. The acceleration scale g† is the knob that does the real work. The bulge slider only acts on galaxies that actually have a bulge - try NGC 2841 or UGC 2885.

Model computed by rar_vpred() and vbar_kms() in Coherence Language, compiled to WebAssembly 1231 bytes sha256 8ae100a0e2dc…. Same source compiles to native and (server-side) to verify. Data: SPARC (Lelli, McGaugh & Schombert 2016).

Show the Coherence Language source