Dark energy constraints using gamma-ray burst correlations with DESI 2024 data

Understand

Even though the Dark Energy Spectroscopic Instrument (DESI) mission does not exclude a dynamical dark energy evolution, the concordance paradigm, i.e., the $\Lambda$CDM model, remains statistically favored, as it depends on the fewest number of free parameters.

• In this respect, high redshift astrophysical sources, such as gamma-ray bursts, represent a formidable tool to model the form of dark energy, since they may provide a link between early and local redshift regimes.
• Hence, the use of these objects as possible distance indicators turns out to be essential to investigate the cosmological puzzle.
• To this end, we adopt two gamma-ray burst linear correlations, namely the $L_p-E_p$ and $L_0-E_p-T$ relations, to test the flat and non-flat $\Lambda$CDM, $\omega_0$CDM, and $\omega_0\omega_1$CDM cosmological models, i.e., those directly examined by the DESI collaboration.