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Title: The 1% concordance Hubble constant

Abstract

The determination of the Hubble constant has been a central goal in observational astrophysics for nearly a hundred years. Extraordinary progress has occurred in recent years on two fronts: the cosmic distance ladder measurements at low redshift and cosmic microwave background (CMB) measurements at high redshift. The CMB is used to predict the current expansion rate through a best-fit cosmological model. Complementary progress has been made with baryon acoustic oscillation (BAO) measurements at relatively low redshifts. While BAO data do not independently determine a Hubble constant, they are important for constraints on possible solutions and checks on cosmic consistency. A precise determination of the Hubble constant is of great value, but it is more important to compare the high and low redshift measurements to test our cosmological model. Significant tension would suggest either uncertainties not accounted for in the experimental estimates or the discovery of new physics beyond the standard model of cosmology. In this paper we examine in detail the tension between the CMB, BAO, and cosmic distance ladder data sets. We find that these measurements are consistent within reasonable statistical expectations and we combine them to determine a best-fit Hubble constant of 69.6 ± 0.7 km s{sup –1}more » Mpc{sup –1}. This value is based upon WMAP9+SPT+ACT+6dFGS+BOSS/DR11+H {sub 0}/Riess; we explore alternate data combinations in the text. The combined data constrain the Hubble constant to 1%, with no compelling evidence for new physics.« less

Authors:
; ;  [1]
  1. Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218 (United States)
Publication Date:
OSTI Identifier:
22370404
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 794; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; BARYONS; COMPARATIVE EVALUATIONS; COSMOLOGICAL MODELS; COSMOLOGY; DISTANCE; EXPANSION; LIMITING VALUES; OSCILLATIONS; RED SHIFT; RELICT RADIATION; STANDARD MODEL

Citation Formats

Bennett, C. L., Larson, D., Weiland, J. L., and Hinshaw, G., E-mail: cbennett@jhu.edu. The 1% concordance Hubble constant. United States: N. p., 2014. Web. doi:10.1088/0004-637X/794/2/135.
Bennett, C. L., Larson, D., Weiland, J. L., & Hinshaw, G., E-mail: cbennett@jhu.edu. The 1% concordance Hubble constant. United States. https://doi.org/10.1088/0004-637X/794/2/135
Bennett, C. L., Larson, D., Weiland, J. L., and Hinshaw, G., E-mail: cbennett@jhu.edu. 2014. "The 1% concordance Hubble constant". United States. https://doi.org/10.1088/0004-637X/794/2/135.
@article{osti_22370404,
title = {The 1% concordance Hubble constant},
author = {Bennett, C. L. and Larson, D. and Weiland, J. L. and Hinshaw, G., E-mail: cbennett@jhu.edu},
abstractNote = {The determination of the Hubble constant has been a central goal in observational astrophysics for nearly a hundred years. Extraordinary progress has occurred in recent years on two fronts: the cosmic distance ladder measurements at low redshift and cosmic microwave background (CMB) measurements at high redshift. The CMB is used to predict the current expansion rate through a best-fit cosmological model. Complementary progress has been made with baryon acoustic oscillation (BAO) measurements at relatively low redshifts. While BAO data do not independently determine a Hubble constant, they are important for constraints on possible solutions and checks on cosmic consistency. A precise determination of the Hubble constant is of great value, but it is more important to compare the high and low redshift measurements to test our cosmological model. Significant tension would suggest either uncertainties not accounted for in the experimental estimates or the discovery of new physics beyond the standard model of cosmology. In this paper we examine in detail the tension between the CMB, BAO, and cosmic distance ladder data sets. We find that these measurements are consistent within reasonable statistical expectations and we combine them to determine a best-fit Hubble constant of 69.6 ± 0.7 km s{sup –1} Mpc{sup –1}. This value is based upon WMAP9+SPT+ACT+6dFGS+BOSS/DR11+H {sub 0}/Riess; we explore alternate data combinations in the text. The combined data constrain the Hubble constant to 1%, with no compelling evidence for new physics.},
doi = {10.1088/0004-637X/794/2/135},
url = {https://www.osti.gov/biblio/22370404}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 794,
place = {United States},
year = {Mon Oct 20 00:00:00 EDT 2014},
month = {Mon Oct 20 00:00:00 EDT 2014}
}