Dark side of the Universe after Planck data

被引：31

作者：

Cheng, Cheng ^{[1
,2
]}

Huang, Qing-Guo ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100190, Peoples R China

来源：

PHYSICAL REVIEW D | 2014年 / 89卷 / 04期

关键词：

BARYON ACOUSTIC-OSCILLATIONS; HUBBLE-SPACE-TELESCOPE; CONSTRAINTS; DISTANCE;

D O I：

10.1103/PhysRevD.89.043003

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Recently released Planck data imply a smaller Hubble constant H-0 than that from the Hubble Space Telescope project (HST) and a larger percentage of the matter components Omega(m) compared to the Supernova Legacy Survey (SNLS) in the. cold dark matter (CDM) model. In this paper we found that even though the tension on H-0 between Planck and HST can be relaxed if the dark radiation is introduced [Delta N-eff 0.536(-0.224)(-0.229) at 68% CL from the data sets of Planck + WMAP polarization (WP) + baryon acoustic oscillation (BAO) + the combination of supernova Union2.1 compilation of 580 Supernovae (Union2.1) + HST], Omega(m) from Planck is still not nicely compatible with that from SNLS. The tensions between Planck and other astrophysical data sets can be significantly relaxed in the wCDM model, and the combination of these data sets prefers a phantomlike dark energy at more than 95% CL: w -1.15 +/- 0.07 and w -1.16 +/- 0.06 at 68% CL from Planck + WP + BAO + Union2.1 + HST and Planck + WP + BAO + SNLS + HST, respectively. From the statistical point of view, there is no evidence for a time-evolving equation of state (Delta chi(2) -0.3 compared to a constant equation of state for the combination of Planck + WP + BAO + SNLS + HST).

引用

页数：8

共 32 条

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