Reconstructing generalized ghost condensate model with dynamical dark energy parametrizations and observational datasets

Details Reconstructing generalized ghost condensate model with dynamical dark energy parametrizations and observational datasets Reconstructing generalized ghost condensate model with dynamical dark energy parametrizations and observational datasets

2006-12-21

arxiv.org/abs/astro-ph/0612642v3

Mod.Phys.Lett.A23:139-152,2008

Astronomy and Astrophysics

Astrophysics

8 pages, 3 figures; references added; accepted for publication in Mod. Phys. Lett. A

Scientific paper

10.1142/S0217732308023505

Observations of high-redshift supernovae indicate that the universe is accelerating at the present stage, and we refer to the cause for this cosmic acceleration as ``dark energy''. In particular, the analysis of current data of type Ia supernovae (SNIa), cosmic large-scale structure (LSS), and the cosmic microwave background (CMB) anisotropy implies that, with some possibility, the equation-of-state parameter of dark energy may cross the cosmological-constant boundary ($w=-1$) during the recent evolution stage. The model of ``quintom'' has been proposed to describe this $w=-1$ crossing behavior for dark energy. As a single-real-scalar-field model of dark energy, the generalized ghost condensate model provides us with a successful mechanism for realizing the quintom-like behavior. In this paper, we reconstruct the generalized ghost condensate model in the light of three forms of parametrization for dynamical dark energy, with the best-fit results of up-to-date observational data.

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