Reproducibility package for: "The Galaxy Acceleration Scale as a Causal-Horizon Threshold"

# Reproducibility package **Paper:** "The Galaxy Acceleration Scale as a Causal-Horizon Threshold: A Parameter-Free Account of the Radial Acceleration Relation and a Falsifiable Prediction for Its Redshift Evolution" **Author:** Neeraj Balyan ([e-mail]) This package contains everything needed to reproduce every numerical result, table, and figure input in the paper: the complete analysis code, the pre-registration records (committed to version control before the corresponding fits were run), all derived data products, and copies of the public input catalogs. ## Layout validation/ analysis scripts 01-23 (chronological) validation/notes_*.md pre-registration records (protocols, branch enumerations, and verdict criteria fixed before fitting) validation/results/ derived products (JSON) for every number quoted in the paper, including the likelihood-ready wide-binary prediction tables (wide_binary_v2.json) data/ copies of the public input catalogs ## Requirements Python 3.10+, numpy, scipy, matplotlib. No other dependencies. ## Reproducing Run scripts from inside `validation/`. They are independent except: 09 before 10/12b/16; 13 before 13b; 16 before 16b. Outputs overwrite `validation/results/`. Approximate runtimes on one CPU core: scripts 01-05, 17-21, 23 run in seconds to minutes; the hierarchical SPARC fits (06, 09-16b) take tens of minutes to a few hours each. Key correspondences to the paper: 06/08/09/10/11 Sec. 3.1; 12/12b Sec. 3.4; 13/13b/14 Sec. 3.1 (error models); 15 Sec. 3.5; 16/16b Sec. 3.6; 18 Sec. 4; 07/22 Sec. 5; 17 Sec. 5.1; 19/20/21 Sec. 6; 02/03/23 Sec. 7. ## Data provenance | file | source | reference | |---|---|---| | sparc_table1.mrt | astroweb.cwru.edu/SPARC (SPARC_Lelli2016c.mrt) | Lelli, McGaugh & Schombert 2016, AJ 152, 157 | | MassModels_Lelli2016c.mrt | astroweb.cwru.edu/SPARC | ibid. | | data/rotmod/*.dat | astroweb.cwru.edu/SPARC (Rotmod_LTG) | ibid. | | BTFR_Lelli2019.mrt.txt | astroweb.cwru.edu/SPARC | Lelli et al. 2019, MNRAS 484, 3267 | | sparc_coords.tsv | VizieR J/AJ/152/157 | ibid. 2016 | | 2mrs.tsv | VizieR J/ApJS/199/26 (table3) | Huchra et al. 2012, ApJS 199, 26 | | tully2015_groups.tsv | VizieR J/AJ/149/171 (table3) | Tully 2015, AJ 149, 171 | | tully2015_members.tsv | VizieR J/AJ/149/171 (table4) | Tully 2015, AJ 149, 171 | | pantheon_plus.dat | github.com/PantheonPlusSH0ES/DataRelease | Brout et al. 2022, ApJ 938, 110 | | (in-script) cluster profiles | transcribed fit parameters | Vikhlinin et al. 2006, ApJ 640, 691 | | (in-script) Bullet apertures | transcribed | Clowe et al. 2006, ApJL 648, L109 | All catalogs retrieved July 2026. Original survey data remain the property of their providers and should be cited as above; the copies here are included solely for reproducibility. ## Rights Analysis code and derived products (c) Neeraj Balyan, 2026. They may be used and redistributed with attribution (please cite the paper).