Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-11-30
Phys.Rev.D73:083526,2006
Astronomy and Astrophysics
Astrophysics
17 pages, 12 figures, references added
Scientific paper
10.1103/PhysRevD.73.083526
We discuss the constraints on the time-varying equation of state for dark energy and the curvature of the universe using observations of type Ia supernovae from Riess et al. and the most recent Supernova Legacy Survey (SNLS), the baryon acoustic oscillation peak detected in the SDSS luminous red galaxy survey and cosmic microwave background. Due to the degeneracy among the parameters which describe the time dependence of the equation of state and the curvature of the universe, the constraints on them can be weakened when we try to constrain them simultaneously, in particular when we use a single observational data. However, we show that we can obtain relatively severe constraints when we use all data sets from observations above even if we consider the time-varying equation of state and do not assume a flat universe. We also found that the combined data set favors a flat universe even if we consider the time variation of dark energy equation of state.
Ichikawa Kazuhide
Takahashi Tomo
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