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2024

Model-independent cosmological inference post DESI DR1 BAO measurements

Mukherjee, Purba, Sen, Anjan Ananda

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In this work, we implement Gaussian process regression to reconstruct the expansion history of the universe in a model-agnostic manner, using the Pantheon-Plus SN-Ia compilation in combination with two different BAO measurements (SDSS-IV and DESI DR1).

In both the reconstructions, the $\Lambda$CDM model is always included in the 95\% confidence intervals.
We find evidence that the DESI LRG data at $z_{\text{eff}} = 0.51$ is not an outlier within our model-independent framework.
We study the $\mathcal{O}m$-diagnostics and the evolution of the total equation of state (EoS) of our universe, which hint towards the possibility of a quintessence-like dark energy scenario with a very slowly varying EoS, and a phantom-crossing in higher $z$.

Model-independent cosmological inference post DESI DR1 BAO measurements · Around

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