sede-cosmology

SEDE III: Cosmology of Structural Entropy Dark Energy (+ Supplement)

Paper III: background cosmology, the FPAB finite-k construction, and the supplement.

Part of the USC research program (SEDE / ECCG / APDM unification).

Status

Pre-submission working repository, seeded 2026-07-17 from a private research hub; full research history (including audit trails and retractions) lives there.

Layout

• paper/ — manuscript sources (SEDE_cosmology.md + supplement, build scripts, refs, built PDF); build tooling under paper/tools/
• src/sede/ — the model package (Friedmann background, data loaders, γ/entropy, …)
• src/experiments/, src/scripts/ — inference drivers and generators
• figures/ — figure generators
• data/ — small public data vectors (see data/README.md); the 32 MB Pantheon+ covariance and CAMB are fetched separately for two figures
• results/ — figures and machine-readable outputs (including predictions.json)

Reproducing the figures

pip install -r requirements.txt
python reproduce.py

Regenerates 8 of the 10 figures from the vendored sede package and the data vectors in data/. fig_e1_mechanism needs CAMB and fig_F5_calibration is regenerated by the inference pipeline below (see "Reproducing the inference"). The full CAMB-in-the-loop pipeline is now vendored here; only the full-primary-CMB (plik) joint and the FPAB/Mochi-CLASS growth sector run in the companion analysis.

Reproducing the inference (headline numbers)

The CAMB-in-the-loop pipeline is vendored under src/experiments/ (needs camb; pip install camb):

bash src/run_all_inference.sh      # ΔDIC, per-probe decomposition, OOS, tracer/γ scans, calibration

Individual drivers: run_probe_decomposition (Δχ² and the per-probe split), run_barrow_mcmc (marginalised ΔDIC, p_D), run_xval_oos (out-of-sample), run_tracer_loo, run_xval_calibration (false-preference mocks). Requires the 33 MB Pantheon+ covariance in data/ (vendored). The

Headline number: use run_probe_decomposition (canonical SEDE: Barrow λ=0.5, γ=1.4964), giving Δχ²(SEDE−ΛCDM) = −4.68. The deprecated run_camb_joint.py fits a different model — the λ=1 "temperature-factor" cousin (E_SEDE_cousin, w0≈−0.86, no w=−1 crossing) — which §3.2 shows is disfavoured; its ΛCDM-preferred Δχ² is the intended cousin-contrast, not the headline (see the script's docstring).

full-primary-CMB (plik) joint and the FPAB/Mochi-CLASS growth sector run in the companion analysis.

Building the PDF

bash paper/build.sh (pandoc + xelatex; the JCAP class and .bst are vendored under paper/tex/). The supplement builds with bash paper/build_supplement.sh.

License

• Text and figures (the paper): CC-BY-4.0
• Code: MIT
• Third-party datasets (Pantheon+, DESI, DES, under data/): retain their original licenses

Citation

See CITATION.cff. A Zenodo DOI will be minted at first release.