The effects of parametrization of the dark energy equation of state

	The effects of parametrization of the dark energy equation of state
	Shi, Ke 1,2; Huang, Yong-Feng 1,2; Lu, Tan3,4
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2011-12-01
卷号	11 期号:12 页码:1403-1412
关键词	cosmology: observations cosmology: cosmological parameters
英文摘要	We investigate in detail the influence of parametrizations of the dark energy equation of state on reconstructing dark energy geometrical parameters, such as the deceleration parameter q(z) and Om diagnostic. We use a type Ia supernova sample, baryon acoustic oscillation data, cosmic microwave background information along with twelve observational Hubble data points to constrain cosmological parameters. With the joint analysis of these current datasets, we find that the parametrizations of w(z) have little influence on the reconstruction result of q(z) and OM. The same is true for the transition (cosmic deceleration to acceleration) redshift z(t), for which we find that for different parametrizations of w(z), the best fitted values of zt are very close to each other (about 0.65). All of our results are in good agreement with the ACDM model. Furthermore, using the combination of datasets, we do not find any signal of decreasing cosmic acceleration as suggested in some recent papers. The results suggest that the influence of the prior w(z) is not as severe as one may anticipate, and thus we can, to some extent, safely use a reasonable parametrization of w(z) to reconstruct some other dark energy parameters (e.g. q(z), Om) with a combination of datasets.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	PROBE WMAP OBSERVATIONS ; COSMOLOGICAL CONSTANT ; QUINTESSENCE ; SUPERNOVAE ; REDSHIFT ; CONSTRAINTS ; PARAMETERS ; COMPONENT ; DYNAMICS ; UNIVERSE
收录类别	SCI
语种	英语
WOS记录号	WOS:000298341000003
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/11051]
专题	紫金山天文台_院士文集_陆埮
作者单位	1.Nanjing Univ, Dept Astron, Nanjing 210093, Jiangsu, Peoples R China 2.Nanjing Univ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China 3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 4.Nanjing Univ, Purple Mt Observ, Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210093, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Shi, Ke,Huang, Yong-Feng,Lu, Tan. The effects of parametrization of the dark energy equation of state[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2011,11(12):1403-1412.
APA	Shi, Ke,Huang, Yong-Feng,&Lu, Tan.(2011).The effects of parametrization of the dark energy equation of state.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,11(12),1403-1412.
MLA	Shi, Ke,et al."The effects of parametrization of the dark energy equation of state".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 11.12(2011):1403-1412.