Empirical Reproducibility of Galactic Rotation Curves under Global Constraints: Results from a SPARC-Wide Analysis

The origin of galaxy rotation curves remains one of the central open questions in astrophysics.Standard dark matter models provide successful phenomenological descriptions buttypically rely on galaxy-dependent halo parametrizations, while alternative approaches suchas Modified Newtonian Dynamics (MOND) introduce acceleration-based modifications togravitational behavior.In this work, we investigate whether statistically reproducible galactic rotation structurecan emerge from a globally constrained empirical framework applied uniformly across theSPARC galaxy sample. The analysis employs fixed response functions together with aminimal set of globally constrained parameters and is evaluated using train/test validationunder heterogeneous galactic conditions.Across the SPARC sample, the framework reproduces consistently stable outer-regionrotational structure, particularly in outer galactic regions where approximately flat rotationcurves are commonly observed. Predictive behavior remains statistically robust acrossdiverse galaxy populations despite substantial variation in morphology, baryonic content,and rotational scale.Importantly, the present study does not claim a definitive physical explanation for theobserved behavior. Rather, it identifies a reproducible empirical regularity that merits furtherinvestigation under globally constrained conditions.