CONSTRAINTS TO DECELERATION PARAMETERS BY RECENT COSMIC OBSERVATIONS

In this paper, two simple parametrized deceleration parameters [Formula: see text] and [Formula: see text] areconstrained by using the latest SNe Ia Gold dataset, observational Hubble data and their combination. It is found that the transition redshift from decelerated expansion to accelerated expansion z T and current decelerated parameter values q 0 are consistent with each other in 1σ region by only using SNe Ia Gold dataset and observational Hubble data in three parametrizations respectively. By combining the SNe Ia Gold dataset and observational Hubble data together, a tight constraint is obtained. With this combined constraint, z T is [Formula: see text] and [Formula: see text] with 1σ error in the parametrizations respectively.

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