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Does Hubble tension signal a breakdown in FLRW cosmology?

Krishnan, C and Mohayaee, R and Colgáin, Eà and Sheikh-Jabbari, MM and Yin, L (2021) Does Hubble tension signal a breakdown in FLRW cosmology? In: Classical and Quantum Gravity, 38 (18).

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Official URL: https://doi.org/10.1088/1361-6382/ac1a81


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 �CDM, we find that low redshift data (z � 2.5) and well-motivated priors only permit a dark energy sector close to the cosmological constant �. 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 H0 � 71 ± 1 km s-1 Mpc-1. Since various local determinations may be converging to H0 � 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. © 2021 IOP Publishing Ltd.

Item Type: Journal Article
Publication: Classical and Quantum Gravity
Publisher: IOP Publishing Ltd
Additional Information: The copyright for this article belongs to Authors
Department/Centre: Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited: 03 Dec 2021 07:09
Last Modified: 03 Dec 2021 07:09
URI: http://eprints.iisc.ac.in/id/eprint/70144

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