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论文类型：期刊论文

发表时间：2008-07-30

发表刊物：MODERN PHYSICS LETTERS A

收录刊物：SCIE、Scopus

卷号：23

期号：23

页面范围：1939-1948

ISSN号：0217-7323

关键字：dark energy; decelerated parameter; transition redshift

摘要：In this paper, two simple parametrized deceleraton parameters q(z) = a + bz/1+z and q(z) = a + b/1+1n(1+z) are constrained by using SNe Ia Gold dataset, observational Hubble data and their combination. It is found that the transition redshift from decelerated expansion to accelerated expansion zT and current decelerated parameter values q0 are consistent with each other in 1 sigma region by only 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, zT is 0.56(-0.09)(+0.18) and 0.54(- 0.09)(+0.19) with 1 sigma error in the parametrizations respectively.