Baryon Acoustic Oscillations and the Hubble constant: past, present and future

We investigate constraints on the Hubble constant (H0) using Baryon Acoustic Oscillations (BAO) and baryon density measurements from Big Bang Nucleosynthesis (BBN). We start by investigating the tension between galaxy BAO measurements and those using the Lyman-α forest, within a Bayesian framework....

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Veröffentlicht in:	Journal of cosmology and astroparticle physics 2019-10, Vol.2019 (10), p.44-44
Hauptverfasser:	Cuceu, Andrei, Farr, James, Lemos, Pablo, Font-Ribera, Andreu
Format:	Artikel
Sprache:	eng
Schlagworte:	Baryons Big bang cosmology Big Bang theory Cosmic microwave background Dark energy Galaxies Hubble constant Nuclear fusion Nuclei (nuclear physics) Oscillations Statistical analysis Tension
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container_title	Journal of cosmology and astroparticle physics
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creator	Cuceu, Andrei Farr, James Lemos, Pablo Font-Ribera, Andreu
description	We investigate constraints on the Hubble constant (H0) using Baryon Acoustic Oscillations (BAO) and baryon density measurements from Big Bang Nucleosynthesis (BBN). We start by investigating the tension between galaxy BAO measurements and those using the Lyman-α forest, within a Bayesian framework. Using the latest results from eBOSS DR14 we find that the probability of this tension being statistical is ≃6.3% assuming flat ΛCDM. We measure H0=67.6±1.1 km s−1 Mpc−1, with a weak dependence on the BBN prior used, in agreement with results from Planck Cosmic Microwave Background (CMB) results and in strong tension with distance ladder results. Finally, we forecast the future of BAO + BBN measurements of H0, using the Dark Energy Spectroscopic Instrument (DESI). We find that the choice of BBN prior will have a significant impact when considering future BAO measurements from DESI.
doi_str_mv	10.1088/1475-7516/2019/10/044
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subjects	Baryons Big bang cosmology Big Bang theory Cosmic microwave background Dark energy Galaxies Hubble constant Nuclear fusion Nuclei (nuclear physics) Oscillations Statistical analysis Tension
title	Baryon Acoustic Oscillations and the Hubble constant: past, present and future
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