Why the Photon Moves: Gravitational Engine of a Non-Closed Torsion Vortex

Standard physics postulates that a photon moves at c because it is massless and follows null geodesics. In the ontological framework A = A + (−A0), a deeper answer arises: the photon is a non-closed torsion vortex in the tension field ∇U. Its intrinsic topological asymmetry produces a permanent imbalance between the temporal (gravitational) and spatial (anti-gravitational) components of tension, acting as a self-contained engine. This note derives the propulsion law, explains why the velocity saturates at c, and proposes observational and laboratory tests to validate the model.