B22: Cross-Scale Interface Regularization in BRISM: CMB Low Multipoles, Galactic Cores, and the Hubble Tension

Two observational regimes that are usually treated as largely independent — large-scale anomalies in the cosmic microwave background and the inner structure of dark-matter-dominated dwarf galaxies — both exhibit a form of suppressed or regularized behavior at their respective infrared limits. In the CMB, this appears as a deficit at low multipoles; in galaxy rotation curves, as finite-density core behavior replacing the expected central cusp. This note explores whether both phenomena can be read as effective manifestations of a common interface scale within the BRISM framework. The structural scale ε = 1/π² is not introduced as a fitted parameter in either sector. It appears as an infrared envelope in the CMB and as a core regularization scale in dark-matter-dominated systems such as IC2574. From this viewpoint, the Hubble tension is not claimed to be solved, but can be re-examined as a possible third instance of a global–local mismatch in effective interface response. The point is not numerical agreement alone, but the recurrence of the same structural scale across otherwise independent observational regimes. For a current top-down overview of the BRISM framework and its wider structural context, see: Current BRISM Top‑Down Overview All BRISM papers on Zenodo >> Searchlist Supplementary structural material, dependency maps, and reproducibility notes are available in an accompanying public repository: https://github.com/swencarloheinze/brism-framework