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Planck Collaboration, N. Aghanim, Y. Akrami, M. Ashdown, J. Aumont, C. Baccigalupi et al., Planck 2018 results. V. CMB power spectra and likelihoods , A&A 641
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1907
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A. Lewis, GetDist: a Python package for analysing Monte Carlo samples , 1910.13970
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1910
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A. Lewis, A. Challinor and A. Lasenby, Efficient Computation of Cosmic Microwave Background Anisotropies in Closed Friedmann-Robertson-Walker Models , ApJ 538
2000
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W. Hu, M. Fukugita, M. Zaldarriaga and M. Tegmark, Cosmic Microwave Background Observables and Their Cosmological Implications , ApJ 549
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W.J. Percival, W. Sutherland, J.A. Peacock, C.M. Baugh, J. Bland-Hawthorn, T. Bridges et al., Parameter constraints for flat cosmologies from cosmic microwave background and 2dFGRS power spectra , MNRAS 337
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J. Torrado and A. Lewis, Cobaya: code for Bayesian analysis of hierarchical physical models , J. Cosmology Astropart. Phys 2021
Original
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S. Alam, M. Aubert, S. Avila, C. Balland, J.E. Bautista, M.A. Bershady et al., Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological implications from two decades of spectroscopic surveys at the Apache Point Observatory , Phys. Rev. D 103
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P. Ade, J. Aguirre, Z. Ahmed, S. Aiola, A. Ali, D. Alonso et al., The Simons Observatory: science goals and forecasts , J. Cosmology Astropart. Phys 2019
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Planck Collaboration, N. Aghanim, Y. Akrami, F. Arroja, M. Ashdown, J. Aumont et al., Planck 2018 results. I. Overview and the cosmological legacy of Planck , A&A 641
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2025

It's All ${\tt Ok}$: Curvature in Light of BAO from DESI DR2

Chen, Shi-Fan, Zaldarriaga, Matias

Understand

Recent measurements of baryon acoustic oscillations (BAO) from the Dark Energy Spectroscopic Instrument (DESI) show hints of tension with data from the cosmic microwave background (CMB) when interpreted within the standard model of cosmology.

In this short note we discuss the consequences of one solution to this tension, a small but negative spatial curvature with $R_k = 21 H_0^{-1}$, which DESI measures at $2\sigma$ when combined with CMB data.
We describe the physical role of curvature in cosmological distance measures tied to recombination, i.e.
the CMB and BAO, and the relation to neutrino mass constraints which are relaxed to $\sum m_\nu < 0.10$ eV at $95\%$ confidence when curvature is allowed to deviate from zero.