Modified gravity interpretation of the evolving dark energy in light of DESI data

Understand

The Dark Energy Spectroscopic Instrument (DESI) collaboration has recently released measurements of baryon acoustic oscillation (BAO) from the first year of observations.

• A joint analysis of DESI BAO, CMB, and SN Ia probes indicates a preference for time-evolving dark energy.
• We evaluate the robustness of this preference by replacing the DESI distance measurements at $z<0.8$ with the SDSS BAO measurements in a similar redshift range.
• Assuming the $w_0w_a$CDM model, we find an evolution of the dark energy equation of state parameters consistent with $\Lambda$CDM.