Implications for dark energy of cosmic transparency in light of DESI data

Understand

The distance duality relation (DDR) between luminosity and angular diameter distances holds if gravity is described by a metric theory and the universe is transparent.

• Recent cosmological inferences using Type Ia supernovae (SNe~Ia), baryon acoustic oscillation (BAO) and the cosmic microwave background (CMB) observations have suggested that dark energy may evolve in time.
• We test how the assumption of distance duality impacts dark energy inference.
• Marginalizing over the absolute SNe~Ia luminosity, we find no deviation from the DDR, independent of the SN~Ia compilation used, or the assumed dark energy model.