Λ: Surface Eigenvalue of the Cosmic Boundary

Einstein introduced Λ cosmological constant in 1917 to hold the universe static. When Hubble proved the universe was expanding, Einstein removed it, calling it his "biggest blunder." A century later, standard cosmology revived Λ as dark energy, a mysterious force accelerating expansion; Einstein vindicated, but for a different reason. Mode Identity Theory completes the arc: there is no dark energy, there is no mysterious force. Λ is the ground-state eigenvalue on the non-orientable cosmic boundary; the geometry of the universe itself driving expansion. Einstein was right the first time, for reasons then unknown. The Möbius surface selects half-integer modes; the lowest yields the topological eigenvalue Λ_top · ℓ_P² ≈ 2Ω⁻¹. The observationally inferred Λ_obs differs by a fixed conversion factor of 3/2, arising from the surface-to-bulk mapping inherent in FRW cosmology.Prediction: 3.0 × 10⁻¹²². Observed: 2.84 × 10⁻¹²². Agreement: 5%. Zero free parameters.