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Prospects for resolving the Hubble constant tension with standard sirens

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Title: Prospects for resolving the Hubble constant tension with standard sirens
Authors: Feeney, SM
Peiris, HV
Williamson, AR
Nissanke, SM
Mortlock, DJ
Alsing, J
Scolnic, D
Item Type: Journal Article
Abstract: The Hubble constant ($H_0$) estimated from the local Cepheid-supernova (SN) distance ladder is in 3-$\sigma$ tension with the value extrapolated from cosmic microwave background (CMB) data assuming the standard cosmological model. Whether this tension represents new physics or systematic effects is the subject of intense debate. Here, we investigate how new, independent $H_0$ estimates can arbitrate this tension, assessing whether the measurements are consistent with being derived from the same model using the posterior predictive distribution (PPD). We show that, with existing data, the inverse distance ladder formed from BOSS baryon acoustic oscillation measurements and the Pantheon SN sample yields an $H_0$ posterior near-identical to the Planck CMB measurement. The observed local distance ladder value is a very unlikely draw from the resulting PPD. Turning to the future, we find that a sample of $\sim50$ binary neutron star "standard sirens" (detectable within the next decade) will be able to adjudicate between the local and CMB estimates.
Issue Date: 14-Feb-2019
Date of Acceptance: 4-Jan-2019
URI: http://hdl.handle.net/10044/1/67123
DOI: https://dx.doi.org/10.1103/PhysRevLett.122.061105
ISSN: 0031-9007
Publisher: American Physical Society
Journal / Book Title: Physical Review Letters
Volume: 122
Copyright Statement: © 2019 American Physical Society
Keywords: astro-ph.CO
02 Physical Sciences
General Physics
Notes: Eight pages, four figures. v3: matches version accepted by Physical Review Letters. Code available at https://github.com/sfeeney/hh0
Publication Status: Published
Article Number: ARTN 061105
Appears in Collections:Physics
Astrophysics
Faculty of Natural Sciences



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