An accelerated universe from Brans-Dicke theory in the Einstein frame

An accelerated universe from Brans-Dicke theory in the Einstein frame
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爱因斯坦框架中布兰斯-迪克理论的加速宇宙

DOI:
10.1140/epjp/i2012-12154-3
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发表时间:
2012-12
影响因子:
3.4
通讯作者:
Jianbo Lu, Shanshan Gao, Yueyue Zhao, Yabo Wu
Jianbo Lu, Shanshan Gao, Yueyue Zhao, Yabo Wu
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Jianbo Lu, Shanshan Gao, Yueyue Zhao, Yabo Wu

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目前宇宙的加速与广义相对论(GR)不一致。GR的替代品得到了广泛的研究。其中之一是Brans-Dicke (BD)理论。其中,大多数双相障碍理论研究都是在乔丹表征框架下进行的。本文从BD理论出发,在另一个框架下研究加速宇宙学。在爱因斯坦坐标系中,它表示物质和BD标量场之间的相互作用。本文采用马尔可夫链蒙特卡罗方法,根据运动学观测数据:Ia型超新星(SNIa)的Union2数据集和哈勃观测数据(OHD),以及动力学观测数据:重子声学振荡(BAO)、宇宙微波背景(CMB)数据和星系团x射线气体质量分数,对BD理论的宇宙约束进行了研究。结果表明,该理论给出了一个从减速到加速的膨胀宇宙。对BD模型参数的约束结果为:β= - 0.0067(±0.2268)- 0.2372 - 0.4407+0.2395+0.4168,γ= 0.0237(±0.0342)- 0.0329 - 0.0647+0.0326+0.0715,ε= - 0.0063(±0.0073)- 0.0073 - 0.0130+0.0072+0.0158;相关宇宙学参数的约束值为:无因次物质densityΩ0m= 0.2853(±0.0132)−0.0133−0.0247+0.0132+0.0262,宇宙年龄= 13.5699(±0.2398)−0.2374−0.4568+0.2371+0.4806Gyr,当前哈勃参数h0 = 70.2623(±1.2695)−1.2675−2.5150+1.2749+2.4532。
The current acceleration of the universe is not consistent with the theory of general relativity (GR). The substitutes of GR have been studied widely. One of them is the Brans-Dicke (BD) theory. Thereinto, most studies of BD theory are in the frame of Jordan representation. In this paper we investigate the accelerating cosmology from BD theory in the other frame,i.e.in the Einstein frame, where it indicates the interaction between the matter and the BD scalar field. We apply the Markov Chain Monte Carlo method to study the cosmic constraints on BD theory according to the current experiment data from the kinematical observations: the Union2 dataset of type supernovae Ia (SNIa) and the observational Hubble data (OHD), and the dynamical observations: the baryon acoustic oscillation (BAO), the cosmic microwave background (CMB) data, and the cluster X-ray gas mass fraction. It is shown that an expanded universe from deceleration to acceleration is given in this theory. And the constraint results on BD model parameters areβ= −0.0067(±0.2268)−0.2372−0.4407+0.2395+0.4168,γ= 0.0237(±0.0342)−0.0329−0.0647+0.0326+0.0715,ε= −0.0063(±0.0073)−0.0073−0.0130+0.0072+0.0158; and the constraints values of some correlative cosmological parameters are the dimensionless matter densityΩ0m= 0.2853(±0.0132)−0.0133−0.0247+0.0132+0.0262, the cosmic age = 13.5699(±0.2398)−0.2374−0.4568+0.2371+0.4806Gyr, and the current Hubble parameterH0= 70.2623(±1.2695)−1.2675−2.5150+1.2749+2.4532.
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DOI: 10.1142/s0217732310032226
发表时间: 2010-03
影响因子: 1.4
作者:
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通讯作者: Lu, Jianbo
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DOI: 10.1016/j.physletb.2011.04.022
发表时间: 2011-05
期刊: Physics Letters B
影响因子: 4.4
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DOI: 10.1007/s10714-008-0656-y
发表时间: 2007-12
影响因子: 2.8
作者:
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DOI: 10.1046/j.1365-8711.2003.06508.x
发表时间: 2002-07
影响因子: 4.8
作者:
E. D. Pietro;J. Claeskens
通讯作者: E. D. Pietro;J. Claeskens
DOI: 10.1140/epjc/s10052-008-0858-1
发表时间: 2008-04
期刊: The European Physical Journal C
影响因子: --
作者:
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通讯作者: Lixin Xu;Wenbo Li;Jianbo Lu