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

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: $\xi =2.63_{-0.52}^{+0.63}$, $\xi +3w_X=-0.98_{-2.07}^{+1.90}$ with the GOLD sample ($1.4\le z\le 5.6$) and $\xi =2.83_{-0.58}^{+0.63}$, $\xi +3w_X=0.03_{-1.33}^{+1.35}$ with the FULL sample ($1.4\le z\le 8.2$), 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.

Comments: Accepted for publication in Journal of High Energy Astrophysics. 13 pages, 3 figures, 2 tables