What question did this study set out to answer?

This research aims to constrain a minimal interacting dark energy model using low-redshift data.

July 16, 2026Open Access

A Phenomenological Interacting Dark Energy Model: Stage I Constraints from Low-Redshift Data

Key Points

This research aims to constrain a minimal interacting dark energy model using low-redshift data.
Employed baseline MCMC analysis on 24 H(z) + 10 fσ8 points (N=34) and an extended check on 38 H(z) + 23 fσ8.
Incorporated diagonal covariance from DESI DR2 BAO data for analysis.
Best-fit interacting dark energy model shows Δχ2≈0 compared to ΛCDM.
Posterior median for interaction parameter β is 0.016 (68% CI [0.002, 0.102]).
Hubble constant estimate H0 is 67.1 km s−1 Mpc−1.

Abstract

Erratum in progress: signs of dark-sector energy exchange and mφ vs H0 wording are under revision; corrected files will appear as a new version (v1.0.2). Do not treat current PDFs/code as final. Stage I preprint (bilingual EN/RU). A minimal interacting dark energy (IDE) model with a scalar field in a quadratic potential and conformal coupling to dark matter is constrained using low-redshift data. Data: baseline MCMC on 24 H(z) + 10 fσ8 points (N=34); extended robustness check on 38 H(z) + 23 fσ8. DESI DR2 BAO enters with diagonal covariance only. Main results: the best-fit IDE is essentially degenerate with ΛCDM (Δχ2≈0). Periodic H(z) modulations with Δz~0.5–1 are not statistically significant. Posterior median β=0.016 (68% CI 0.002, 0.102), H0=67.1 km s−1 Mpc−1. This work does not claim to resolve cosmological tensions; full Planck/CLASS analysis is deferred to Stage II. Files: English PDF (primary), Russian PDF (translation), and reproducibility zip (catalogs + Python scripts + MCMC reports). All files are released under CC-BY-4.0.

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