Observer-Normalized Scale Coherence: Cross-Regime Tests of Acceleration-Domain Inference Using SPARC This archive contains analysis code, supporting data, and generated outputs for empirical tests of the Observer-Normalized Scale Coherence framework using disk galaxy data from the SPARC catalog. The central question addressed is whether a significant portion of the apparent dynamical discrepancy in galaxies arises from observer-centric normalization mismatch, rather than from missing mass components or modified dynamics. Within this framework, global inference across intrinsically non-equivalent systems is constrained by coherence rather than enforced equivalence. When inference is renormalized coherently, acceleration-domain relations emerge with substantially reduced scatter. All analyses in this archive are performed using a single, frozen inference rule. “Frozen” refers to the definitions of observables and the inference mapping itself, not to dataset-specific quality cuts or regime-appropriate scale proxies. Results Snapshot Using a frozen acceleration-domain coherence quantity applied to the SPARC disk galaxy sample, the inferred coherence exhibits bounded, order-unity scatter when galaxies are grouped by intrinsic morphology. This behavior survives explicit stress tests against distance covariance, alternate radius definitions, and surface-brightness systematics. Applying the same inference rule unchanged to the low-mass and dwarf-galaxy regime yields consistent, non-divergent behavior without parameter tuning or renormalization. Scientific Scope Paper I — Disk Galaxy Coherence (SPARC)Observer-Normalized Scale Relativity: Coherence Constraints on Global Physical Inference and Disk Galaxy Dynamics Paper I introduces a dimensionless acceleration-domain coherence quantity, J≡GMbV2R,J \equiv \frac{G M_b}{V^2 R},J≡V2RGMb, and demonstrates that when disk galaxies are grouped by intrinsic morphology, this form exhibits substantially reduced scatter relative to density-based normalizations. The analysis emphasizes: operational independence of observables (mass, velocity, scale), stability under distance covariance, robustness to radius definition, and residual structure traced to surface brightness rather than parameter tuning. All robustness tests are adversarial in intent and are designed to dismantle the observed coherence if it is a bookkeeping artifact. Paper II — Pre-Registered Dwarf Galaxy PredictionObserver-Normalized Scale Coherence II: Execution of a Pre-Registered Prediction in the Dwarf Galaxy Regime Paper II executes a pre-registered observational prediction defined in Paper I: the same frozen acceleration-domain coherence logic is applied, unchanged, to the low-mass and dwarf galaxy regime. If the framework lacks physical content, the prediction should fail. No new parameters, constants, or regime-specific modifications are introduced. The same baryonic mass definition, kinematic proxy, and spatial scale are used. The test is designed to be maximally hostile to overfitting. Repository Contents Analysis Scripts sparc_j_tests.pyImplements the Paper I analysis. Computes the Newtonian (Q=1) acceleration-domain coherence form and evaluates scatter across morphology bins. Includes stress tests against distance covariance, alternate radius definitions (Reff, Rdisk, RHI), and surface-brightness systematics. sparc_dwarf_prediction.pyImplements the Paper II pre-registered prediction. Applies the same frozen coherence logic to low-mass and dwarf systems and computes the predicted dynamical-to-baryonic mass discrepancy, MdynMb=1J.\frac{M_{\mathrm{dyn}}}{M_b} = \frac{1}{J}.MbMdyn=J1. Reports scatter and residual structure without fitting, tuning, or renormalization. sparc_j_tests_with_residuals.pyAuxiliary diagnostic script for Paper I. Visualizes median-centered residual structure in the coherence quantity and tests for trivial dependence on mass, velocity, or scale. This script performs no fitting or correction and does not modify any reported results. Data Raw SPARC.xlsxSPARC summary table (v1), included unchanged for convenience. All analyses read directly from this file. Outputs outputs/ — results for Paper I outputs_paper2/ — results for Paper II These directories contain CSV summary tables and residual diagnostics generated by the analysis scripts. Methodological Notes All observables (mass, velocity, scale) are inferred through independent channels. No parameters are fit in any analysis. All definitions used in Paper II are frozen from Paper I. Distance, radius, and surface-brightness systematics are explicitly tested. The same inference rule is applied across mass regimes without modification. The analysis pipeline is intentionally frozen to minimize researcher degrees of freedom. Related Zenodo Records This repository is part of a series of archived research artifacts exploring observer-normalized coherence constraints in galactic dynamics and their observational consequences: Observer-Normalized Scale Relativity: A Coherence Constraint on Global Physical Inference (core framework):https://doi.org/10.5281/zenodo.18356675 Stress Testing Observer-Normalized Coherence in Disk Galaxies (SPARC):https://doi.org/10.5281/zenodo.18294837 Predictive Results in the Dwarf-Galaxy Regime:https://doi.org/10.5281/zenodo.18308519 Inference Lens Demonstration (illustrative example):https://doi.org/10.5281/zenodo.18436273 Execution Requirements: Python 3.9+, numpy, pandas, matplotlib. Place the scripts and Raw SPARC.xlsx in the same directory and run: python sparc_j_tests.py python sparc_dwarf_prediction.py