The Electron as a Propagating Torsion Bound State in a Cosserat Medium

Under the single postulate that the universe consists of a continuous elastic Cosserat medium, we derive the electron as a bound state of the propagating torsion field around a proton soliton. Starting from the micro-rotation kinetic energy and anti-symmetric shear energy of the Cosserat medium, we rigorously obtain the effective mass m_T and kinetic coupling g_T of the torsion field. By coupling this torsion field to the spherically symmetric Dirac equation, numerical solution reveals that the second energy level of the bound-state spectrum automatically emerges at ~0.5 MeV within the natural parameter range. Introducing the microscopic inertia moment j of the medium and calibrating it against the experimental electron mass, we obtain g_T = 0.74, m_T = 348 MeV, and a perfect self-consistency ratio R = 1.000000 between the two independent derivations of j. The corresponding microscopic characteristic scale is ℓ_micro ≈ 0.004 fm. The theory requires only three free parameters, and the electron mass is derived from first principles for the first time. Falsifiable predictions for the proton scalar polarizability, torsion-induced spin–spin force, etc., are also presented.