Hierarchical Gaussian-process test of DESI's dynamical dark-energy preference

Yu-Hao Mu, Zhihuan Zhou, Enkun Li

DESI DR2 BAO combined with CMB and Type~Ia supernovae in the Chevallier--Polarski--Linder (CPL) parameterisation prefers evolving dark energy over $\Lambda$CDM at roughly $2.8$--$4.2\sigma$.…