scholarly journals Scale-dependent bias in the baryonic-acoustic-oscillation-scale intergalactic neutral hydrogen

2014 ◽  
Vol 89 (8) ◽  
Author(s):  
Andrew Pontzen
Keyword(s):  
Neutral Hydrogen ◽  
Acoustic Oscillation ◽  
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 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.

scholarly journals Isobaric Reconstruction of the Baryonic Acoustic Oscillation

2017 ◽  
Vol 841 (2) ◽  
pp. L29 ◽  
Author(s):  
Xin Wang ◽  
Hao-Ran Yu ◽  
Hong-Ming Zhu ◽  
Yu Yu ◽  
Qiaoyin Pan ◽  
...  
Keyword(s):  
Acoustic Oscillation ◽  
Baryonic Acoustic Oscillation

THE RANKING OF f(R) THEORIES AMONG ALTERNATIVE COSMOLOGICAL SCENARIOS

2012 ◽  
Vol 18 ◽  
pp. 150-155
Author(s):  
NILZA PIRES
Keyword(s):  
General Relativity ◽  
Model Selection ◽  
Cosmological Model ◽  
Observational Data ◽  
Modified Gravity ◽  
Acoustic Oscillation ◽  
Information Criteria ◽  
Accelerated Expansion ◽  
Data Set ◽  
Baryonic Acoustic Oscillation

There are many cosmological scenarios that try to explain the observed current accelerated expansion. They are based or on the existence of new fields in nature or on the modification of the gravitation theory. This work investigates the observational viability of a modified gravity f(R) = R - α/ Rn within the Palatine approach, in the light of 32 age measurements of passively evolving galaxies and the baryonic acoustic oscillation peak scale. By using information-criteria model selection, this scenario is compared with the DGP alternative cosmological model as well the adjustable components of energy based in the general relativity based int the observational data set.

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