Speaker
Description
The Distance Duality Relation (DDR) is a cornerstone of the standard cosmological model, a direct consequence of basic assumptions such as photon conservation and the validity of null geodesics. Any detectable violation of this relation would provide a definitive signature of new physics, ranging from cosmic opacity and axion-like particles to modified theories of gravity. In this talk, I will present a comprehensive framework for testing the DDR by combining a wide range of observations, discussing the synergy between Type Ia Supernovae and BAO data, as well as the impact that future gravitational waves detectors will have on this line of investigation. I will also introduce a new approach to DDR testing based on non-parametric reconstruction methods, moving beyond standard power-law parametrizations.