Cosmological implications of different baryon acoustic oscillation data
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- 作者：Shuang Wang ; YaZhou Hu ; Miao Li
- 关键词：cosmology ; dark energy ; observations ; cosmological parameters
- 刊名：Science China Physics, Mechanics & Astronomy
- 出版年：2017
- 出版时间：April 2017
- 年：2017
- 卷：60
- 期：4
- 全文大小：
- 刊物类别：Physics and Astronomy
- 刊物主题：Physics, general; Classical and Continuum Physics; Astronomy, Observations and Techniques;
- 出版者：Science China Press
- ISSN：1869-1927
- 卷排序：60
文摘
In this work, we explore the cosmological implications of different baryon acoustic oscillation (BAO) data, including the BAO data extracted by using the spherically averaged one-dimensional galaxy clustering (GC) statistics (hereafter BAO1) and the BAO data obtained by using the anisotropic two-dimensional GC statistics (hereafter BAO2). To make a comparison, we also take into account the case without BAO data (hereafter NO BAO). Firstly, making use of these BAO data, as well as the SNLS3 type Ia supernovae sample and the Planck distance priors data, we give the cosmological constraints of the ΛCDM, the wCDM, and the Chevallier-Polarski-Linder (CPL) model. Then, we discuss the impacts of different BAO data on cosmological consquences, including its effects on parameter space, equation of state (EoS), figure of merit (FoM), deceleration-acceleration transition redshift, Hubble parameter H(z), deceleration parameter q(z), statefinder hierarchy S3(1)(z), S4(1)(z) and cosmic age t(z). We find that: (1) NO BAO data always give a smallest fractional matter density Ωm0, a largest fractional curvature density Ωk0 and a largest Hubble constant h; in contrast, BAO1 data always give a largest Ωm0, a smallest Ωk0 and a smallest h. (2) For the wCDM and the CPL model, NO BAO data always give a largest EoS w; in contrast, BAO2 data always give a smallest w. (3) Compared with the case of BAO1, BAO2 data always give a slightly larger FoM, and thus can give a cosmological constraint with a slightly better accuracy. (4) The impacts of different BAO data on the cosmic evolution and the comic age are very small, and cannot be distinguished by using various dark energy diagnoses and the cosmic age data.