Constraints on the Phase Plane of the Dark Energy Equation of State

Details Constraints on the Phase Plane of the Dark Energy Equation of State Constraints on the Phase Plane of the Dark Energy Equation of State

2009-05-17

arxiv.org/abs/0905.2738v2

Phys.Lett.B682:267-273,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

14 pages, 5 figures, "Test of the method" added in Sec. 4 in v2

Scientific paper

10.1016/j.physletb.2009.10.092

Classification of dark energy models in the plane of w and w', where w is the dark energy equation of state and w' its time-derivative in units of the Hubble time, has been studied in the literature. We take the current SN Ia, CMB and BAO data, invoke a widely used parametrization of the dark energy equation of state, and obtain the constraints on the w -w' plane. We find that dark energy models including the cosmological constant, phantom, non-phantom barotropic fluids, and monotonic up-rolling quintessence are ruled out at the 68.3% confidence level based on the current observational data. Down-rolling quintessence, including the thawing and the freezing models, is consistent with the current observations. All the above-mentioned models are still consistent with the data at the 95.4% confidence level.

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