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论文类型：期刊论文

发表时间：2007-10-01

发表刊物：INTERNATIONAL JOURNAL OF MODERN PHYSICS D

收录刊物：SCIE、Scopus

卷号：16

期号：10

页面范围：1573-1579

ISSN号：0218-2718

关键字：Kaluza-Klein theory; cosmology; dark energy

摘要：We use a parameterized equation of state (EOS) of dark energy to a 5D Ricci-flat cosmological solution and suppose the universe contains two major components: dark matter and dark energy. Using the recent observational datasets: the latest 182 type Ia Supernovae Gold data, the three-year WMAP CMB shift parameter and the SDSS baryon acoustic peak, we obtain the best fit values of the EOS and two major components' evolution. We find that the best fit EOS crosses -1 in the near past where z similar or equal to 0.07, the present best fit value of w(x)(0) < -1 and for this model, the universe experiences the acceleration at about z similar or equal to 0.5.