A consistency test of the cosmological model at the epoch of recombination using DESI BAO and Planck measurements

Understand

The value of the Hubble constant determined from CMB and BAO measurements is directly dependent on the sound horizon at the photon-baryon decoupling.

• There has been significant interest in the possibility of new physics at the epoch around recombination that could reduce the sound horizon and increase the inferred value of $H_0$, thus helping to relieve the Hubble tension.
• One way to determine if new physics is required would be to measure $H_0$ from BAO and CMB without assuming any model for computing the sound horizon.
• In this study, we use the recently released DESI Year 1 BAO data combined with the CMB acoustic scale and the Planck $\Lambda$CDM prior on $\Omega_{\rm m} h^2$ to determine $H_0$ while treating the sound horizon at baryon decoupling $r_{\rm d}$ as a free parameter.