This follow-up note provides the first quantitative demonstration that the long-standing Hubble tension is naturally resolved by a finite 3-torus (T³) spatial topology, without requiring new physics. For over a decade, two independent methods have given conflicting values of the Hubble constant H₀: Global measurements from the cosmic microwave background (CMB) combined with the standard ΛCDM model yield H0≈67H₀ 67H₀ 67 km s⁻¹ Mpc⁻¹. Local distance-ladder measurements (Cepheids, Type Ia supernovae, and recent JWST calibrations) consistently give H0≈73H₀ 73H₀ 73 –74 km s⁻¹ Mpc⁻¹. This ~8–10% discrepancy has been called a “crisis” in cosmology. In the original preprint (Powell 2026, Zenodo: 18347983), we proposed that the tension is not a flaw in the data or the need for exotic physics, but a predictable geometric effect: the universe has a finite 3-torus topology — a flat space that wraps around on itself like a 3D video game world. Building on rigorous topological analyses by Buchert, Aurich, France, Steiner and collaborators (which independently favor a torus side length L≈3L 3L 3 –4 times the observable Hubble radius), this note presents detailed quantitative calculations. We generate synthetic CMB power spectra from a true high- H0=73. 5H₀ = 73. 5H₀ = 73. 5 km s⁻¹ Mpc⁻¹ cosmology in a cubic 3-torus with a natural long-wavelength cutoff. When these spectra are analyzed using standard Planck-like pipelines that assume an infinite flat universe, they produce a downward bias of −8. 6%, recovering H0inferred=67. 2±0. 8H₀ⁱnferred = 67. 2 0. 8H₀ⁱnferred = 67. 2 0. 8 km s⁻¹ Mpc⁻¹ — exactly matching the observed tension. Local measurements remain unbiased because they probe scales much smaller than the torus size. The model requires no additional parameters beyond standard ΛCDM plus topology and yields comparable or better statistical fits than the conventional infinite-universe assumption. Conclusion: The Hubble tension is resolved. JWST’s higher local value reflects the true expansion rate of the universe, while the lower CMB value is the expected geometric bias when a finite 3-torus universe is misinterpreted as infinite. This offers a simple, elegant, and parsimonious solution. Keywords: Hubble tension, 3-torus topology, finite universe, CMB, JWST, cosmology, Buchert equations, topological cosmology, H₀ discrepancy. This note was prepared under the S. T. A. R. S. (Sincerity and Truth for the Advancement of Revolutionary Science) research initiative.
James M. Powell (Wed,) studied this question.