The length of the low-redshift standard ruler

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Title: The length of the low-redshift standard ruler
Authors: Verde, L
Luis Bernal, J
Heavens, AF
Jimenez, R
Item Type: Journal Article
Abstract: Assuming the existence of standard rulers, standard candles and standard clocks, requiring only the cosmological principle, a metric theory of gravity, a smooth expansion history and using state-of-the-art observations, we determine the length of the ‘low-redshift standard ruler’. The data we use are a compilation of recent baryon acoustic oscillation data (relying on the standard ruler), Type Ia supernovae (as standard candles), ages of early-type galaxies (as standard clocks) and local determinations of the Hubble constant (as a local anchor of the cosmic distance scale). In a standard Λ cold dark matter cosmology, the ‘low-redshift standard ruler’ coincides with the sound horizon at radiation drag, which can also be determined – in a model dependent way – from cosmic microwave background observations. However, in general, the two quantities need not coincide. We obtain constraints on the length of the low-redshift standard ruler: rhs=101.0±2.3h−1 rsh=101.0±2.3h−1 Mpc, when using only Type Ia supernovae and baryon acoustic oscillations, and rs = 150.0 ± 4.7 Mpc when using clocks to set the Hubble normalization, while rs = 141.0 ± 5.5 Mpc when using the local Hubble constant determination (using both yields rs = 143.9 ± 3.1 Mpc). The low-redshift determination of the standard ruler has an error, which is competitive with the model-dependent determination from cosmic microwave background measurements made with the Planck satellite, which assumes that it is the sound horizon at the end of baryon drag.
Issue Date: 17-Jan-2017
Date of Acceptance: 13-Jan-2017
ISSN: 0035-8711
Publisher: Oxford University Press
Start Page: 731
End Page: 736
Volume: 467
Issue: 1
Copyright Statement: © 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. This is a pre-copy-editing, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The definitive publisher-authenticated version Licia Verde, José Luis Bernal, Alan F. Heavens, Raul Jimenez; The length of the low-redshift standard ruler. Mon Not R Astron Soc 2017; 467 (1): 731-736. doi: 10.1093/mnras/stx116 is available online at:
Sponsor/Funder: Imperial College Trust
Imperial College Trust
Science and Technology Facilities Council
Science and Technology Facilities Council (STFC)
Funder's Grant Number: N/A
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
supernovae: general
cosmology: distance scale
scale structure of the Universe
0201 Astronomical And Space Sciences
Publication Status: Published
Open Access location:
Appears in Collections:Physics

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