Strong progenitor age bias in supernova cosmology and concordance with DESI BAO

Supernova (SN) cosmology is based on the key assumption that the luminosity standardization process of type Ia SNe must be invariant with progenitor age. However, recent studies of SN host galaxies show significant (5.5 sigma) correlations between the standardized SN luminosity and progenitor age, which should cause a serious systematic bias with redshift in SN cosmology. Here we show that, after correcting for this age bias with redshift, SN dataset aligns more closely with the recent DESI BAO result in the wowaCDM model, making the revised 'standard candle' (SNe) in concordance with the 'standard ruler' (BAO). When the three cosmological probes (SNe, BAO, CMB) are combined, we find a strong (> 7 sigma) discordance with the LCDM model, indicating a time-varying dark energy equation of state in a currently non-accelerating universe.