Probing Dark Energy Evolution Post-DESI 2024

Understand

We study the evidence for dark energy (DE) evolution at low redshift, using baryonic acoustic oscillations (BAOs) from the DESI Early Data Release, Pantheon+ Type Ia supernovae (SNe-Ia), and redshift space distortions (RSDs) to constrain cosmological parameters.

• Furthermore, we make use of the angular acoustic scale to analyse the effect of introducing condensed CMB information on the cosmological parameters informing DE evolution.
• The analysis is divided into cases based on the variability of priors inferred from early-time physics.
• Using a quadratic parametrisation, $X(z)$, for DE density, we find evidence for DE evolution in all cases, both with and without the angular acoustic scale.