IE cosmology vs ΛCDM: posterior MCMC chains, likelihood scripts and reproducible notebook (v1)

This deposit contains the posterior MCMC chains (HDF5), the comparison notebook, and the case-specific likelihood/cosmology scripts used for a strict like-for-like comparison between the Iterative Energetics (IE) cosmology and ΛCDM using late-time data only: Pantheon+/SH0ES SNe (STAT+SYS in the eigen-basis) and BOSS DR12 compressed BAO. The goal is full reproducibility of the analysis and the statistical summaries/figures. Contents • IE_vs_LambdaCDM_MCMC_chains_v1.zip • cases/ (Baseline, WideTS, OmFree, CheckCMB) with .h5 chains for IE and ΛCDM • notebooks/CosmoModelCompare.ipynb (post-processing & figures) • results/ (reproduced outputs) • IE_vs_LambdaCDM_helper_files_v1.zip • README.md (reproduction guide) • requirements.txt, environment.yml • LICENSE (MIT for code), LICENSES/CC0-1.0.txt (data) • CITATION.cff • (optional) IE_vs_LambdaCDM_LaTeX_sources_v1.zip — LaTeX sources and figures for the preprint. Reproducibility (quick start) 1. Create the environment: conda env create -f environment.yml(or) pip install -r requirements.txt. 2. Open notebooks/CosmoModelCompare.ipynb. 3. Select a case directory (e.g., cases/Baseline/PriorPlanck/…) and run all cells.The notebook locates the .h5 chains and reproduces diagnostic tables (WAIC/PSIS-LOO, AIC/BIC/DIC, blockwise χ²) and the comparison figures used in the manuscript. Licensing • Code & notebooks: MIT License. • Data products (chains, figures, CSVs): CC0 1.0 Universal.The record-level Zenodo license applies to the dataset entry; file-level licenses are included in the repository and prevail for those files. Recommended citation Prieto López, C. (2025). IE cosmology vs ΛCDM: posterior MCMC chains, likelihood scripts and reproducible notebook (v1). Zenodo. [e-mail] Keywordscosmology; ΛCDM; dark energy; supernovae; BAO; Pantheon+; BOSS DR12; H₀; MCMC; emcee; ArviZ; WAIC; PSIS-LOO.