Does Hubble tension signal a breakdown in FLRW cosmology?

By Chethan Krishnan, Roya Mohayaee, Eoin 'O Colg'ain, M. Sheikh-Jabbari, Lu Yin. Classical and quantum gravity, 2021

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The tension between early and late Universe probes of the Hubble constant has motivated various new FLRW cosmologies. Here, we reanalyse the Hubble tension with a recent age of the Universe constraint. This allows us to restrict attention to matter and a dark energy sector that we treat without assuming a specific model. Assuming analyticity of the Hubble parameter H(z), and a generic low redshift modification to flat ΛCDM, we find that low redshift data (z ≲ 2.5) and well-motivated priors only permit a dark energy sector close to the cosmological constant Λ. This restriction rules out late Universe modifications within FLRW. We show that early Universe physics that alters the sound horizon can yield an upper limit of H 0 ∼ 71 ± 1 km s−1 Mpc−1. Since various local determinations may be converging to H 0 ∼ 73 km s−1 Mpc−1, a breakdown of the FLRW framework is a plausible resolution. We outline how future data, in particular strongly lensed quasar data, could also provide further confirmations of such a resolution.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/b14e65a2453e2f42db7e6817a9c9fdd8f6ea1041

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Citations in the corpus

On the Evolution of the Hubble Constant with the SNe Ia Pantheon Sample and Baryon Acoustic Oscillations: A Feasibility Study for GRB-Cosmology in 2030 (2022, background): “[150] discuss how the breakdown of Friedmann-Lemaitre-Robertson-Walker (FLRW, [151]) may be a plausible assumption to alleviate the Hubble tension.”
Toward a Better Understanding of Cosmic Chronometers: A New Measurement of H(z) at z ∼ 0.7 (2021, background): “The age–redshift relations can be used to set constraints on the Hubble constant H0, and other cosmological parameters (e.g., Jimenez et al. 2019; Vagnozzi et al. 2021b; Krishnan et al. 2021).”
The Ups and Downs of Early Dark Energy solutions to the Hubble tension: A review of models, hints and constraints circa 2023 (2023, unknown): “[59] Chethan Krishnan, Roya Mohayaee, Eoin Ó.”