Empirical Validation of the Sigma–Schmidt Duality A Superior Fit to DESI DR2 BAO Data Compared to ΛCDM

This record presents the empirical validation of the Sigma–Schmidt Duality as a cosmological model tested against full DESI DR2 BAO data.The analysis includes χ² comparisons, parameter scanning and robustness checks, showing that the two-parameter σ(t) deformation provides a significantly improved fit relative to ΛCDM.The PDF contains methodology, data handling, residual analysis and full reproducibility notes.This upload is part of an ongoing research series developing the dual scalar-field interpretation of cosmic expansion and its observational signatures.