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The evidence for a spatially flat Universe
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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.
Forward citations
Cited by 9 Pith papers
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Quasar cosmology II: joint analyses with Cosmic Microwave Background
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Impact of DESI BAO Data on Inflationary Parameters: stability against late-time new physics
Using CMB, supernova, and DESI BAO data, this study finds that inflationary parameters n_s and A_s remain stable (shifts under 1%) when SDSS BAO data is replaced by DESI BAO data across several late-time models.
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Exponential $f(R)$ cosmology with massive neutrinos as a dynamical dark energy framework
Exponential f(R) gravity with massive neutrinos fits current expansion data about as well as ΛCDM and yields slightly different H0 and Σmν constraints, but does not eliminate the Hubble tension.
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Alleviating cosmological tensions with a hybrid dark sector
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Late Time Dynamical Dark Energy and the CMB-Distance Ladder Tension
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Late-time cosmological constraints on three holographic dark energy models with DESI DR2 BAO and Type Ia supernovae
DESI DR2 and late-time data constrain HDE, ADE and RDE, yielding H0≈67–68 km/s/Mpc, c≈1, n≈2.8, γ≈0.54, with none resolving the Hubble tension or decisively beating ΛCDM.
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QCD CP-violation scenario for a revised cosmological dynamics: analysis of the binned Pantheon Sample of Super Novae Ia
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