Current constraints on interacting holographic dark energy

Details Current constraints on interacting holographic dark energy Current constraints on interacting holographic dark energy

2007-05-07

arxiv.org/abs/0705.1006v3

Phys.Lett.B659:34-39,2008

Astronomy and Astrophysics

Astrophysics

revtex4, three figures. Last version to appear in Physics Letters B

Scientific paper

10.1016/j.physletb.2007.10.061

Although there is mounting observational evidence that the cosmic expansion is undergoing a late-time acceleration, the physical mechanism behind such a phenomenon is yet unknown. In this paper, we investigate a holographic dark energy (HDE) model with interaction between the components of the dark sector in the light of current cosmological observations. We use both the new \emph{gold} sample of 182 type Ia supernovae (SNe Ia) and the 192 SNe Ia ESSENCE data, the baryon acoustic oscillation measurement from the Sloan Digital Sky Survey and the shift parameter from the three-year Wilkinson Microwave Anisotropy Probe data. In agreement with previous results, we show that these observations suggest a very weak coupling or even a noninteracting HDE. The phantom crossing behavior in the context of these scenarios is also briefly discussed.

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