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论文类型：期刊论文

发表时间：2010-06-07

发表刊物：MODERN PHYSICS LETTERS A

收录刊物：SCIE

卷号：25

期号：17

页面范围：1441-1454

ISSN号：0217-7323

关键字：Cosmology; holographic dark energy; Brans-Dicke theory; MCMC

摘要：In this paper,the holographic dark energy in Brans-Dicke theory is confronted by cosmic observations from SN Ia, BAO, OHD and CMB via Markov-Chain Monte-Carlo (MCMC) method. The best fit parameters are found in 1 sigma region: Omega(h0) = 0.725(-0.0330)(+0.0268), c = 0.807(-0.160)(+0.165), H-0 = 70.436(-3.0743)(+3.245) and alpha = 0.00248(-0.00609)(+0.00549) (equivalently omega = 2415.653 which is less than the solar system bound and consistent with other constraint results). With these best fit values of the parameters, it is found that the universe is undergoing accelerated expansion,and the current value of equation of state of holographic dark energy w(h0) = -1.0376(-0.121)(+0.129) which is phantom like in Brans-Dicke theory. The effective Newton's constant decreases with the expansion of our universe for the negative value of model parameter alpha.