Shows that GFD resolves the underdetermined interaction potential in ghost-free bimetric gravity. The coupling polynomial from dual tetrahedral geometry locks the five Hassan-Rosen coefficients to integers and recovers the constitutive law with no fitted parameters.
Introduces the inverse pipeline: two algebraically invertible field equations that transform observed galaxy rotation curves into effective mass profiles using only G and a₀. Applied to the Milky Way, M33, NGC 3198, and CamB with zero free parameters.
The foundation paper. Derives the covariant scalar-tensor action from the stellated octahedron topology required by field closure in 3+1 dimensions. Bidirectional validation spanning 36 orders of magnitude, from neutron lifetime to galactic rotation, with zero adjustable parameters.