Constraining the dark fluid

Kunz, Martin, Liddle, Andrew R., Parkinson, David and Gao, Changjun (2009) Constraining the dark fluid. Physical Review D: Particles, Fields, Gravitation, and Cosmology, 80 8: 083533-1-083533-6. doi:10.1103/PhysRevD.80.083533

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Author Kunz, Martin
Liddle, Andrew R.
Parkinson, David
Gao, Changjun
Title Constraining the dark fluid
Journal name Physical Review D: Particles, Fields, Gravitation, and Cosmology   Check publisher's open access policy
ISSN 0556-2821
1089-4918
1550-7998
Publication date 2009-10
Sub-type Article (original research)
DOI 10.1103/PhysRevD.80.083533
Open Access Status File (Publisher version)
Volume 80
Issue 8
Start page 083533-1
End page 083533-6
Total pages 6
Place of publication College Park, MD, United States
Publisher American Physical Society
Language eng
Formatted abstract
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.
Keyword Quintessence
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mathematics and Physics
 
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Citation counts: TR Web of Science Citation Count  Cited 29 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 25 times in Scopus Article | Citations
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Created: Mon, 28 Feb 2011, 09:45:42 EST