Cosmic Variance and the G2 Topology: CMB Low-ℓAnomalies as Group-Theoretic Selection Center for Magnetic Resonance Research

The CMB low-ℓanomalies — quadrupole suppression, quadrupole-octopole alignment, and the hemispherical asymmetry — are unsolved within ΛCDM and conventionally attributed to "cosmic variance." In the One-Octonion Brane-Bulk Framework, all three are group-theoretic consequences of the G2 = Aut(O) Cartan structure of the brane. The quadrupole (ℓ= 2, 5-dimensional irrep of SO(3)) is absent from the small G2 representations 7 and 14, appearing first in 27. The suppression factor is Dobs 2 /DΛCDM 2 = 0.223, matching the framework prediction 7/27 × 6/7 = 0.2222 (deviation 0.4%). The quadrupole-octopole alignment follows from the G2 ⊃SU(3) branching pattern, which couples ℓ= 2 and ℓ= 3 at fixed Cartan axis. The hemispherical asymmetry traces to the H+/H−sector decomposition of the octonion algebra. Zero free parameters. Five falsifiable predictions, including a specific quantitative test of the ℓ= 4 amplitude in forthcoming Simons Observatory data. Part of the One-Octonion Brane-Bulk Framework series. Anchor DOI: 10.5281/zenodo.19120873. Community: one-octonion-brane-bulk. Author: Bharathi Dasan Jagadeesan, M.D., University of Minnesota. ORCID: 0000-0002-1143-941X.