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2024

Consistency tests between SDSS and DESI BAO measurements

Ghosh, Basundhara, Bengaly, Carlos

Understand

In this work, we investigate whether the baryon acoustic oscillation (BAO) measurements from redshift surveys, like the Sloan Digital Sky Survey (SDSS), and the Dark Energy Spectroscopic Instrument (DESI), are consistent with each other.

We do so by obtaining the Hubble and deceleration parameter, respectively $H(z)$ and $q(z)$, from both datasets using a non-parametric reconstruction, so that our results do not depend on any $\textit{a priori}$ assumptions about the underlying cosmological model.
We find that the reconstructed $H(z)$ and $q(z)$ from SDSS are significantly inconsistent with those obtained from DESI, and that both are only marginally consistent with the $\Lambda$CDM model ($\sim 3\sigma$ confidence level).
Interestingly, the combined SDSS and DESI dataset reconciles with the standard model.