Constraining the dark fluid

	Constraining the dark fluid
	Kunz, Martin 1; Liddle, Andrew R.1,3; Parkinson, David 1; Gao, Changjun2
刊名	PHYSICAL REVIEW D
	2009-10-01
卷号	80 期号:8
英文摘要	Cosmological observations are normally fit under the assumption that the dark sector can be decomposed into dark matter and dark energy components. However, as long as the probes remain purely gravitational, there is no unique decomposition and observations can only constrain a single dark fluid; this is known as the dark degeneracy. We use observations to directly constrain this dark fluid in a model-independent way, demonstrating, in particular, that the data cannot be fit by a dark fluid with a single constant equation of state. Parametrizing the dark fluid equation of state by a variety of polynomials in the scale factor a, we use current kinematical data to constrain the parameters. While the simplest interpretation of the dark fluid remains that it is comprised of separate dark matter and cosmological constant contributions, our results cover other model types including unified dark energy/matter scenarios.
收录类别	SCI
语种	英语
WOS记录号	WOS:000271353700048
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/7964]
专题	国家天文台_星系宇宙学研究部
作者单位	1.Univ Sussex, Ctr Astron, Brighton BN1 9QH, E Sussex, England 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 3.Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA
推荐引用方式 GB/T 7714	Kunz, Martin,Liddle, Andrew R.,Parkinson, David,et al. Constraining the dark fluid[J]. PHYSICAL REVIEW D,2009,80(8).
APA	Kunz, Martin,Liddle, Andrew R.,Parkinson, David,&Gao, Changjun.(2009).Constraining the dark fluid.PHYSICAL REVIEW D,80(8).
MLA	Kunz, Martin,et al."Constraining the dark fluid".PHYSICAL REVIEW D 80.8(2009).