CosmoVerse@Krakow: Ruchika: BAO Anomalies after DESI Release

This series is the recording of the CosmoVerse@Krakow conference that happened between 9 and 11 July 2024.

Ruchika:
BAO Anomalies after DESI Release

In the era of tensions, when precision cosmology is blooming, numerous new theoretical models are emerging. However, it's crucial to pause and question the extent to which the observational data we rely on are model-dependent. In this work, we study the comoving position of the acoustic peak, a cornerstone standard ruler in cosmology. We considered BAO observational datasets from two distinct teams and calculated $r_d$ sound horizon value with the help of each BAO data set along with SN I-a data from the Pantheon Plus sample. Our conclusion at present is there is a significant amount of tension within two independent BAO datasets. We further go on to say that while one BAO data set allows solutions like Early Dark Energy, the other completely rules out $r_d$ tension and hence the possibility of early modifications of $r_d$ such as EDE as a solution to Hubble Tension.

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