COSMIC CONSTRAINTS ON HOLOGRAPHIC DARK ENERGY IN BRANS-DICKE THEORY VIA MARKOV-CHAIN MONTE-CARLO METHOD

被引：9
|
作者：
Xu, Lixin [1 ]
Liu, Zhaofei [1 ]
Lu, Jianbo [1 ]
Li, Wenbo [1 ]
机构：
[1] Dalian Univ Technol, Inst Theoret Phys, Sch Phys & Optoelect Technol, Dalian 116024, Peoples R China
来源：
MODERN PHYSICS LETTERS A | 2010年 / 25卷 / 17期
关键词：
Cosmology; holographic dark energy; Brans-Dicke theory; MCMC; FIELD ELLIPTIC GALAXIES; COSMOLOGICAL CONSTANT; INTERMEDIATE REDSHIFT; SUPERNOVAE; QUINTESSENCE; UNIVERSE; LAMBDA; AGES;
D O I：
10.1142/S0217732310032755
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
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.
引用
收藏
页码：1441 / 1454
页数：14
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