Speaker
Description
Several studies in the literature have found a discrepancy between Baryon Acoustic Oscillation (BAO) measurements derived from two distinct methodologies, i.e. the two-dimensional (2D, angular) and the three-dimensional (3D, anisotropic) BAO. Since these probes play a key role in building the inverse distance ladder, this inconsistency affects discussions on the Hubble tension and its theoretical solutions. With the aid of type Ia Supernovae (SNIa) and through a largely model-independent approach, we reinterpret this discrepancy in terms of a BAO tension and study the effects of replacing the angular components of the 3D BAO data from BOSS/eBOSS with the recent data from DESI Y1. The tension is found to be at ∼2𝜎 and ∼2.5𝜎, respectively, when the SNIa of the Pantheon+ compilation are used, rising to ∼4.6𝜎 with DESY5. In view of these results, we apply a calibrator-independent method to test the robustness of the distance duality relation, finding no evidence of its violation. Remarkably, we show how 2D and 3D BAO leave an imprint on completely different scales when studying the late-time phenomenology required to solve the Hubble crisis, assuming that standard physics holds before recombination.
