HUBBLE PARAMETER MEASUREMENT CONSTRAINTS ON THE COSMOLOGICAL DECELERATION-ACCELERATION TRANSITION REDSHIFT

被引：298

作者：

Farooq, Omer ^{[1
]}

Ratra, Bharat ^{[1
]}

机构：

[1] Kansas State Univ, Dept Phys, Manhattan, KS 66506 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2013年 / 766卷 / 01期

基金：

美国国家科学基金会;

关键词：

cosmological parameters; cosmology: observations; dark energy; EQUATION-OF-STATE; DARK-ENERGY; SPACE-TELESCOPE; CONSTANT; TIME; EXPANSION; HISTORY; MODELS; GAS;

D O I：

10.1088/2041-8205/766/1/L7

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We compile a list of 28 independent measurements of the Hubble parameter between redshifts 0.07 <= z <= 2.3 and use this to place constraints on model parameters of constant and time-evolving dark energy cosmologies. These H(z) measurements by themselves require a currently accelerating cosmological expansion at about, or better than, 3 sigma confidence. The mean and standard deviation of the six best-fit model deceleration-acceleration transition redshifts (for the three cosmological models and two Hubble constant priors we consider) are z(da) = 0.74 +/- 0.05, in good agreement with the recent Busca et al. determination of z(da) = 0.82 +/- 0.08 based on 11 H(z) measurements between redshifts 0.2 <= z <= 2.3, almost entirely from baryon-acoustic-oscillation-like data.

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