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The evidence for a spatially flat Universe

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arxiv 2002.06892 v1 pith:U5CPEWCO submitted 2020-02-17 astro-ph.CO hep-th

George Efstathiou , Steven Gratton This is my paper
classification astro-ph.COhep-th
keywords planckuniverseflatspatiallyconstraintscurvaturedatageometrical
verification ladder T0 review T1 audit T2 compute T3 formal
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We revisit the observational constraints on spatial curvature following recent claims that the Planck data favour a closed Universe. We use a new and statistically powerful Planck likelihood to show that the Planck temperature and polarization spectra are consistent with a spatially flat Universe, though because of a geometrical degeneracy cosmic microwave background spectra on their own do not lead to tight constraints on the curvature density parameter Omega_K. When combined with other astrophysical data, particularly geometrical measurements of baryon acoustic oscillations, the Universe is constrained to be spatially flat to extremely high precision, with Omega_ K = 0.0004 +/-0.0018 in agreement with the 2018 results of the Planck team. In the context of inflationary cosmology, the observations offer strong support for models of inflation with a large number of e-foldings and disfavour models of incomplete inflation.

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Cited by 10 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

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    astro-ph.CO 2025-10 accept novelty 6.0 of 10

    Even after rescaling BAO data to prefer H0≈73 km/s/Mpc, none of six tested late-time dark-energy models can resolve the Hubble tension once unanchored SNeIa and CMB geometry are included.

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    A frequentist profile-likelihood analysis of DESI, Planck, ACT, and eBOSS Lyman-alpha data yields Σmν < 53 meV (95% C.L.) in flat ΛCDM and a CMB-independent bound of 285 meV.

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    Latent-f and latent-H Gaussian process reconstructions from OHD data both yield f(z), w(z), and Om(z) consistent with Lambda-CDM, with no strong predictive preference and small prior-dependent residuals mainly at high...

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    gr-qc 2025-11 conditional novelty 5.0 of 10

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    astro-ph.CO 2026-04 unverdicted novelty 4.0 of 10

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  10. QCD CP-violation scenario for a revised cosmological dynamics: analysis of the binned Pantheon Sample of Super Novae Ia

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