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2020

Cosmology Intertwined IV: The Age of the Universe and its Curvature

Di Valentino, Eleonora, Anchordoqui, Luis A., Akarsu, Ozgur et al.

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A precise measurement of the curvature of the Universe is of primeval importance for cosmology since it could not only confirm the paradigm of primordial inflation but also help in discriminating between different early Universe scenarios.

The recent observations, while broadly consistent with a spatially flat standard $\Lambda$ Cold Dark Matter ($\Lambda$CDM) model, are showing tensions that still allow (and, in some cases, even suggest) a few percent deviations from a flat universe.
In particular, the Planck Cosmic Microwave Background power spectra, assuming the nominal likelihood, prefer a closed universe at more than 99\% confidence level.
While new physics could be in action, this anomaly may be the result of an unresolved systematic error or just a statistical fluctuation.

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