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Constraining the dark fluid
Kunz, Martin1; Liddle, Andrew R.1,3; Parkinson, David1; Gao, Changjun2
Source PublicationPHYSICAL REVIEW D
AbstractCosmological 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.
Indexed BySCI
WOS IDWOS:000271353700048
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Cited Times:30[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.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
Recommended Citation
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).
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