Cosmological implications of baryon acoustic oscillation measurements
Here, we derive constraints on cosmological parameters and tests of dark energy models from the combination of baryon acoustic oscillation (BAO) measurements with cosmic microwave background (CMB) data and a recent reanalysis of Type Ia supernova (SN) data. Particularly, we take advantage of highprecision BAO measurements from galaxy clustering and the Lymanα forest (LyaF) in the SDSSIII Baryon Oscillation Spectroscopic Survey (BOSS). Treating the BAO scale as an uncalibrated standard ruler, BAO data alone yield a high confidence detection of dark energy; in combination with the CMB angular acoustic scale they further imply a nearly flat universe. Adding the CMBcalibrated physical scale of the sound horizon, the combination of BAO and SN data into an “inverse distance ladder” yields a measurement of H _{0}=67.3±1.1 km s ^{1} Mpc ^{1}, with 1.7% precision. This measurement assumes standard prerecombination physics but is insensitive to assumptions about dark energy or space curvature, so agreement with CMBbased estimates that assume a flat ΛCDM cosmology is an important corroboration of this minimal cosmological model. For constant dark energy (Λ), our BAO+SN+CMB combination yields matter density Ω _{m}=0.301±0.008 and curvature Ω _{k}=0.003±0.003. When we allow more general forms of evolving dark energy, the BAO+SN+CMB parameter constraintsmore »
 Authors:

^{[1]}
 CNRS/IN2P3. Univ. Paris (France). Observatoire de Paris. AstroParticule et Cosmologie (APC); et al.
 Publication Date:
 Report Number(s):
 BNL1118352016JA; BNL1120912016JA
Journal ID: ISSN 15507998; PRVDAQ; KA2301020
 Grant/Contract Number:
 SC00112704; AC0205CH11231
 Type:
 Accepted Manuscript
 Journal Name:
 Physical Review. D, Particles, Fields, Gravitation and Cosmology
 Additional Journal Information:
 Journal Volume: 92; Journal Issue: 12; Journal ID: ISSN 15507998
 Publisher:
 American Physical Society (APS)
 Research Org:
 Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
 Sponsoring Org:
 USDOE Office of Science (SC), High Energy Physics (HEP) (SC25); National Science Foundation (NSF)
 Contributing Orgs:
 BOSS Collaboration
 Country of Publication:
 United States
 Language:
 English
 Subject:
 79 ASTRONOMY AND ASTROPHYSICS
 OSTI Identifier:
 1335432
 Alternate Identifier(s):
 OSTI ID: 1229593; OSTI ID: 1335397; OSTI ID: 1378692
Aubourg, Eric. Cosmological implications of baryon acoustic oscillation measurements. United States: N. p.,
Web. doi:10.1103/PhysRevD.92.123516.
Aubourg, Eric. Cosmological implications of baryon acoustic oscillation measurements. United States. doi:10.1103/PhysRevD.92.123516.
Aubourg, Eric. 2015.
"Cosmological implications of baryon acoustic oscillation measurements". United States.
doi:10.1103/PhysRevD.92.123516. https://www.osti.gov/servlets/purl/1335432.
@article{osti_1335432,
title = {Cosmological implications of baryon acoustic oscillation measurements},
author = {Aubourg, Eric},
abstractNote = {Here, we derive constraints on cosmological parameters and tests of dark energy models from the combination of baryon acoustic oscillation (BAO) measurements with cosmic microwave background (CMB) data and a recent reanalysis of Type Ia supernova (SN) data. Particularly, we take advantage of highprecision BAO measurements from galaxy clustering and the Lymanα forest (LyaF) in the SDSSIII Baryon Oscillation Spectroscopic Survey (BOSS). Treating the BAO scale as an uncalibrated standard ruler, BAO data alone yield a high confidence detection of dark energy; in combination with the CMB angular acoustic scale they further imply a nearly flat universe. Adding the CMBcalibrated physical scale of the sound horizon, the combination of BAO and SN data into an “inverse distance ladder” yields a measurement of H0=67.3±1.1 km s1 Mpc1, with 1.7% precision. This measurement assumes standard prerecombination physics but is insensitive to assumptions about dark energy or space curvature, so agreement with CMBbased estimates that assume a flat ΛCDM cosmology is an important corroboration of this minimal cosmological model. For constant dark energy (Λ), our BAO+SN+CMB combination yields matter density Ωm=0.301±0.008 and curvature Ωk=0.003±0.003. When we allow more general forms of evolving dark energy, the BAO+SN+CMB parameter constraints are always consistent with flat ΛCDM values at ≈1σ. And while the overall χ2 of model fits is satisfactory, the LyaF BAO measurements are in moderate (2–2.5σ) tension with model predictions. Models with early dark energy that tracks the dominant energy component at high redshift remain consistent with our expansion history constraints, and they yield a higher H0 and lower matter clustering amplitude, improving agreement with some low redshift observations. Expansion history alone yields an upper limit on the summed mass of neutrino species, Σmν<0.56 eV (95% confidence), improving to Σmν<0.25 eV if we include the lensing signal in the Planck CMB power spectrum. In a flat ΛCDM model that allows extra relativistic species, our data combination yields Neff=3.43±0.26; while the LyaF BAO data prefer higher Neff when excluding galaxy BAO, the galaxy BAO alone favor Neff≈3. Finally, when structure growth is extrapolated forward from the CMB to low redshift, standard dark energy models constrained by our data predict a level of matter clustering that is high compared to most, but not all, observational estimates.},
doi = {10.1103/PhysRevD.92.123516},
journal = {Physical Review. D, Particles, Fields, Gravitation and Cosmology},
number = 12,
volume = 92,
place = {United States},
year = {2015},
month = {12}
}