Interpreting Cosmic Birefringence and DESI Data with Evolving Axion in $\hat{I}›$CDM

Shota Nakagawa, Yuichiro Nakai, Yu-Cheng Qiu +1

Recent cosmological observations have revealed growing tensions with the standard $\hat{I}›$CDM model, including indications of isotropic cosmic birefringence and deviations from $w = -1…