Investigating Cosmic Discordance

2020/03/31 by Eleonora Di Valentino, Alessandro Melchiorri, Joseph Silk · 1 citation
Physics and Astronomy · #Astronomy and Astrophysical Research #COSMIC cancer database #Cold dark matter #Cosmic microwave background #Cosmological constant #Cosmology #Cosmology and Gravitation Theories #Dark energy #Galaxies: Formation, Evolution, Phenomena #Hubble's law #Observational cosmology #Planck #astro-ph.CO #gr-qc #hep-ph

paper · pdf · doi:10.3847/2041-8213/abe1c4

published as Astrophysical Journal Letters, 908, L9, 2021 · 5 pages, 4 figures. Matches published version

openalex publication_date 2021/02/01 · arxiv created 2021/02/11 · openalex created_date 2021/02/15 · arxiv updated 2021/02/17 · openalex updated_date 2026/08/05

Abstract

Abstract We show that a combined analysis of cosmic microwave background anisotropy power spectra obtained by the Planck satellite and luminosity distance data simultaneously excludes a flat universe and a cosmological constant at 99% confidence level. These results hold separately when combining Planck with three different data sets: the two determinations of the Hubble constant from Riess et al. and Freedman et al., and the Pantheon catalog of high-redshift Type Ia supernovae. We conclude that either the Lambda cold dark matter model needs to be replaced by a different paradigm, or else there are significant but still undetected systematics. Our result calls for new observations and stimulates the investigation of alternative theoretical models and solutions.

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