Abstract
The new 182 gold supernova Ia data, the baryon acoustic oscillation measurement and the shift parameter determined from the Sloan Digital Sky Survey, and the three-year Wilkinson Microwave Anisotropy Probe data are combined to reconstruct the dark energy equation of state parameter and the deceleration parameter . We find that the strongest evidence of acceleration happens around the redshift and the stringent constraints on lie in the redshift range . At the sweet spot, for the dark energy parametrization at the confidence level. The transition redshift when the Universe underwent the transition from deceleration to acceleration is derived to be . The combined data is also applied to find out the geometry of the Universe, and we find that at the confidence level, for the simple one-parameter dark energy model, and for the model.
2 More- Received 7 December 2006
DOI:https://doi.org/10.1103/PhysRevD.75.043520
©2007 American Physical Society