scholarly journals Cosmological constraints from baryonic acoustic oscillation measurements

Scholarpedia ◽  
2015 ◽  
Vol 10 (9) ◽  
pp. 32149
Author(s):  
Jean-Marc Goff ◽  
Vanina Ruhlmann-Kleider
Keyword(s):  
Acoustic Oscillation ◽  
Cosmological Constraints ◽  
Baryonic Acoustic Oscillation

scholarly journals OBSERVATIONAL H(z) DATA AS A COMPLEMENTARITY TO OTHER COSMOLOGICAL PROBES

2009 ◽  
Vol 24 (21) ◽  
pp. 1699-1709 ◽  
Author(s):  
HUI LIN ◽  
CHENG HAO ◽  
XIAO WANG ◽  
QIANG YUAN ◽  
ZE-LONG YI ◽  
...  
Keyword(s):  
Cosmic Microwave Background ◽  
Acoustic Oscillation ◽  
Microwave Background ◽  
Shift Parameter ◽  
Data Set ◽  
Flat Universe ◽  
Baryonic Acoustic Oscillation ◽  
Cosmological Observations

In this paper, we use a set of observational H(z) data (OHD) to constrain the ΛCDM cosmology. This data set can be derived from the differential ages of the passively evolving galaxies. Meanwhile, the [Formula: see text]-parameter, which describes the Baryonic Acoustic Oscillation (BAO) peak, and the newly measured value of the Cosmic Microwave Background (CMB) shift parameter [Formula: see text] are used to present combinational constraints on the same cosmology. The combinational constraints favor an accelerating flat universe while the flat ΛCDM cosmology is also analyzed in the same way. We obtain a result compatible with that by many other independent cosmological observations. We find that the observational H(z) data set is a complementarity to other cosmological probes.

scholarly journals Constraining the ΛCDM and Galileon models with recent cosmological data

2017 ◽  
Vol 600 ◽  
pp. A40 ◽  
Author(s):  
J. Neveu ◽  
V. Ruhlmann-Kleider ◽  
P. Astier ◽  
M. Besançon ◽  
J. Guy ◽  
...  
Keyword(s):  
Cosmological Parameters ◽  
Acoustic Oscillation ◽  
Gravity Models ◽  
Accelerated Expansion ◽  
Data Sets ◽  
Late Time ◽  
Lunar Laser Ranging ◽  
Cosmological Constraints ◽  
Cosmological Data ◽  
Speed Of Propagation

Aims. The Galileon theory belongs to the class of modified gravity models that can explain the late-time accelerated expansion of the Universe. In previous works, cosmological constraints on the Galileon model were derived, both in the uncoupled case and with a disformal coupling of the Galileon field to matter. There, we showed that these models agree with the most recent cosmological data. In this work, we used updated cosmological data sets to derive new constraints on Galileon models, including the case of a constant conformal Galileon coupling to matter. We also explored the tracker solution of the uncoupled Galileon model. Methods. After updating our data sets, especially with the latest Planck data and baryonic acoustic oscillation (BAO) measurements, we fitted the cosmological parameters of the ΛCDM and Galileon models. The same analysis framework as in our previous papers was used to derive cosmological constraints, using precise measurements of cosmological distances and of the cosmic structure growth rate. Results. We show that all tested Galileon models are as compatible with cosmological data as the ΛCDM model. This means that present cosmological data are not accurate enough to distinguish clearly between the two theories. Among the different Galileon models, we find that a conformal coupling is not favoured, contrary to the disformal coupling which is preferred at the 2.3σ level over the uncoupled case. The tracker solution of the uncoupled Galileon model is also highly disfavoured owing to large tensions with supernovae and Planck+BAO data. However, outside of the tracker solution, the general uncoupled Galileon model, as well as the general disformally coupled Galileon model, remain the most promising Galileon scenarios to confront with future cosmological data. Finally, we also discuss constraints coming from the Lunar Laser Ranging experiment and gravitational wave speed of propagation.

scholarly journals Alcock–Paczyński test with model-independent BAO data

2016 ◽  
Vol 26 (06) ◽  
pp. 1750055 ◽  
Author(s):  
F. Melia ◽  
M. López-Corredoira
Keyword(s):  
Acoustic Oscillation ◽  
Total Density ◽  
Spherically Symmetric ◽  
Active Mass ◽  
Sharp Feature ◽  
Baryonic Acoustic Oscillation ◽  
State Formula ◽  
Symmetric Source ◽  
Model Independent ◽  
Friedmann Robertson Walker

Cosmological tests based on the statistical analysis of galaxy distributions usually depend on source evolution. An exception is the Alcock–Paczyński (AP) test, which is based on the changing ratio of angular to spatial/redshift size of (presumed) spherically-symmetric source distributions with distance. Intrinsic redshift distortions due to gravitational effects may also have an influence, but they can now be overcome with the inclusion of a sharp feature, such as the Baryonic Acoustic Oscillation (BAO) peak. Redshift distortions affect the amplitude of the peak, but impact its position only negligibly. As we shall show here, the use of this diagnostic, with new BAO peaks from SDSS-III/BOSS at average redshifts [Formula: see text], [Formula: see text] and [Formula: see text], disfavors the current concordance ([Formula: see text]CDM) model at [Formula: see text]. Within the context of expanding Friedmann–Robertson–Walker (FRW) cosmologies, these data instead favor the zero active mass equation-of-state, [Formula: see text], where [Formula: see text] and [Formula: see text] are, respectively, the total density and pressure of the cosmic fluid, the basis for the [Formula: see text] universe.

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