Measuring cosmic curvature with non-CMB observations

2024/11/10 by Peng-Ju Wu, Xin Zhang, Wu, Peng-Ju +1 · 12 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Phenomenology (hep-ph)

paper · pdf · doi:10.48550/arxiv.2411.06356

openalex publication_date 2024/11/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The cosmic curvature Ω_K is an important parameter related to the inflationary cosmology and the ultimate fate of the universe. In this work, we adopt the non-CMB observations to constrain Ω_K in the ΛCDM model and its extensions. The DESI baryon acoustic oscillation, DES type Ia supernova, cosmic chronometer, and strong gravitational lensing time delay data are considered. We find that the data combination favors an open universe in the ΛCDM model, specifically Ω_K=0.108±0.056 at the 1σ confidence level, which is in 2.6σ tension with the Planck CMB result supporting our universe being slightly closed. In the ΛCDM extensions, the data combination is consistent with a spatially flat universe. However, the central value of Ω_K is positive and has a significant deviation from zero. We adopt the Akaike information criterion to compare different cosmological models. The result shows that non-flat models fit the observational data better than the flat ΛCDM model, which adds evidence to the argument that flat ΛCDM is not the ultimate model of cosmology.

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• Probing departures from ΛCDM by late-time datasets
• Inflation, Open Universes, and Dark Energy
• Constraining deviations from ΛCDM in the Hubble expansion rate
• Is the ΛCDM Model in Crisis?
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• Dynamical dark energy parameterizations in VCDM

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• Constraints on cosmic curvature from cosmic chronometer and quasar observations
• Observational constraints on the non-flat ΛCDM model and a null test using the transition redshift
• Cosmic curvature on large-scale structures with homogeneous dark energy
• Cosmological constraints from standardized non-CMB observations
• The importance of local measurements for cosmology