Testing the Fluid Space Theory (FST) against ΛCDM and MOND with SPARC Galaxy Rotation Curves: B6 Scheme Results

We present a systematic test of the Fluid Space Theory (FST) using the SPARC galaxy rotation curve database. Among six fitting schemes (B1–B6), we focus on the B6 weakly-prior, unbiased fitting scheme, which yields more stable parameter distributions and significantly reduces boundary‑collision issues compared to earlier versions. Using a sample of 175 galaxies, our analysis shows that FST achieves the best Bayesian Information Criterion (BIC) score in 46.3% of cases, outperforming both ΛCDM (27.4%) and MOND (26.3%). We also discuss parameter degeneracy effects and demonstrate the robustness of the B6 scheme for rotation curve fitting. This upload contains the full preprint PDF, together with supplementary materials: all fitting codes, raw data, results, and figures to ensure full reproducibility of our analysis.