Cosmological implications of different baryon acoustic oscillation data

Cosmological implications of different baryon acoustic oscillation data
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不同重子声振荡数据的宇宙学意义

DOI:
10.1007/s11433-016-0486-6
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发表时间:
2015-06
期刊:
Sci. China Phys. Mech. Astron.
影响因子:
--
通讯作者:
Miao Li
Miao Li
中科院分区:
其他
文献类型:
--
作者:
Shuang Wang;Yazhou Hu;Miao Li

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在这项工作中,我们探索了不同重子声振荡(BAO)数据的宇宙学意义,包括利用球平均一维星系团(GC)统计量(以下简称BAO1)提取的重子声学振荡数据(以下简称BAO1)和利用各向异性二维星系团统计量(以下简称BAO2)获得的重子声振荡(BAO)数据(以下简称BAO2)。为了进行比较,我们还考虑了没有BAO数据的情况(以下简称无BAO)。首先,利用这些BaO数据,以及SNLS3型Ia型超新星样本和普朗克距离先验数据,我们给出了Λ模型、wCDM模型和Chvallier-Polarski-Linder模型的宇宙学约束。然后,我们讨论了不同的BaO数据对宇宙学性质的影响,包括它对参数空间、状态方程(Eos)、优值系数(FOM)、减速-加速度跃迁红移、哈勃参数H(Z)、减速参数q(Z)、状态探测等级S3(1)(Z)、S4(1)(Z)和宇宙AGET(Z)的影响。我们发现:(1)没有BaO的数据总是给出最小的分数物质密度Ωm0,最大的分数曲率密度Ωk0和最大的哈勃常数h;相反,BaO数据总是给出最大的Ωm0,最小的Ωk0和一个小的哈勃常数。(2)对于wCDM和CPL模型,没有BAO数据总是给出最大的EoSw,相反,BAO2数据总是给出最小的EoSw。(3)与BAO1的情况相比,BAO2数据总是给出一个略大的FOM,因此可以给出一个精度略高的宇宙学约束。(4)不同的BAO数据对宇宙演化和宇宙年龄的影响很小,不能通过各种暗能量诊断和宇宙年龄数据来区分。
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, thewCDM, 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 parameterH(z), deceleration parameterq(z), statefinder hierarchyS3(1)(z),S4(1)(z) and cosmic aget(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 Ωk0and a smallesth. (2) For thewCDM and the CPL model, NO BAO data always give a largest EoSw; in contrast, BAO2 data always give a smallestw. (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.
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