MSFCM Observational Test — Sensitivity Analysis of the Redshift Proxy for Filament Velocity Dispersion (Preliminary Cross-match: SDSS/FIRST × Carrón Duque 2022)

Preliminary observational test of the Martini Spin-Filament Coupling Model (MSFCM) against real data. We cross-match 2, 997 radio AGN with jet position angles from SDSS DR17/FIRST against the Carrón Duque et al. (2022) filament catalogue (Block 1, z=0. 05–0. 45). The central finding is INDETERMINATE: meancos2 > 0 in all bins (direction consistent with MSFCM), but p > 0. 05 due to signal dilution from the redshift proxy used as a surrogate for filament velocity dispersion σ. We quantify the dilution: with fH ≈ 0. 10 (true fraction of σ ≥ 200 km/s filaments in the proxy-HIGH bin), the expected observed signal is meancos2 ≈ 0. 015, consistent with the measured value of +0. 013 to +0. 031. The LOW bin (σ 0. 70, confirming 100% specificity. The definitive test requires the Tempel et al. (2014) catalogue with measured σ per filament. Pipeline, AGN sample, and analysis code are validated and ready. All results SHA-256 certified. Author: Ariel Fernando Martini, Buenos Aires, Argentina (2026). Contact: arielₘartini₃@hotmail. com