Cosmological Constraints on the Phenomenological Interacting Dark Energy Model with Fermi Gamma-Ray Bursts and DESI DR2

TL;DR

This study constrains an interacting dark energy model using gamma-ray burst and DESI data, finding it consistent with the standard cosmological model and no significant deviations.

Contribution

First joint analysis of Fermi GRB and DESI DR2 data to constrain the phenomenological interacting dark energy model.

Findings

Interacting dark energy parameters are consistent with the standard model within 1σ.

No significant deviations from ΛCDM detected using AIC and BIC.

The model fits current observational data well.

Abstract

In this work, we constrain the phenomenological interacting dark energy (IDE) model using \emph{Fermi} gamma-ray burst (GRB) dataset and the latest baryon acoustic oscillation (BAO) data from the Dark Energy Spectroscopic Instrument (DESI) Data Release 2 (DR2). Through a joint Bayesian analysis, we perform a cosmological comparative assessment of the $\Lambda$CDM, $w$CDM, and CPL models with the phenomenological IDE model. For the phenomenological IDE model in a flat universe with \emph{Fermi} samples and DESI DR2, we obtain: $\xi=2.63^{+0.63}_{-0.52}$, $\xi + 3w_X = -0.98^{+1.90}_{-2.07}$ with the GOLD sample ($1.4\le z \le5.6$) and $\xi=2.83^{+0.63}_{-0.58}$, $\xi + 3w_X = 0.03^{+1.35}_{-1.33}$ with the FULL sample ($1.4\le z \le8.2$), respectively. Our analysis shows that the $\Lambda$CDM model without interaction ($\xi=3$, $\xi + 3w_X = 0$) is consistent with the latest \emph{Fermi} sample and DESI DR2 at $1\sigma$ confidence level. We find no significant deviations from the standard model using AIC and BIC criterias.