The Hubble constant tension with next-generation galaxy surveys
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Date
2020
Journal Title
Journal ISSN
Volume Title
Publisher
IOP Publishing Ltd
Abstract
The rate at which the universe is expanding today is a fundamental parameter in
cosmology which governs our understanding of structure formation and dark energy. However, current measurements of the Hubble constant, H0, show a significant tension (∼ 4–6σ)
between early- and late-Universe observations. There are ongoing efforts to check the diverse
observational results and also to investigate possible theoretical ways to resolve the tension
— which could point to radical extensions of the standard model. Here we demonstrate
the potential of next-generation spectroscopic galaxy surveys to shed light on the Hubble
constant tension. Surveys such as those with Euclid and the Square Kilometre Array (SKA)
are expected to reach sub-percent precision on Baryon Acoustic Oscillation (BAO) measurements of the Hubble parameter, with a combined redshift coverage of 0.1 < z < 3. This
wide redshift range, together with the high precision and low level of systematics in BAO
measurements, mean that these surveys will provide independent and tight constraints on
H(z). These H(z) measurements can be extrapolated to z = 0 to provide constraints on H0
using a non-parametric regression.
Description
Keywords
Baryon acoustic oscillations, Cosmological parameters from LSS, Cosmological simulations, Redshift surveys, Dark energy
Citation
Bengaly, C. A.P. et al. (2020). The Hubble constant tension with next-generation galaxy surveys. Journal of Cosmology and Astroparticle Physics, 2020(05)