Speaker
Description
Recent supernova measurements from Pantheon+, DES Y5, and Union3 tend to prefer high values of the fractional matter density, Omega_m, relative to CMB + BAO data or even Pantheon supernova constraints. This preference has important consequences on cosmological constraints for both early universe and late universe dark energy models. I will highlight some of these consequences. In particular, I examine the effect on constraints from sound-horizon-independent data (CMB lensing + supernova + BBN) on early dark energy (EDE) models, finding that the preference for high Omega_m reduces the allowed parameter space where EDE could resolve the Hubble tension. Additionally, I explore how these high Omega_m values contribute to the DESI results that prefer dynamical dark energy over a cosmological constant.