扭曲DGP宇宙学正规分支的观测约束
Observational Constraints on the Normal Branch of a Warped DGP Cosmology
摘要：
利用Ia型超新星（SNIa）、重子声学振荡（BAO）、宇宙微波背景（CMB）和星系团重子气体质量分数的观测数据，研究了扭曲DGP膜世界宇宙学正常分支的观测约束.用Gold样品SNIa+CMB位移参数+BAO+星系团中重子气体质量分数得到的无模型参数在$1σ$置信区间的最佳拟合值为：$Ω_m=0.240^{+0.050}_{-0.130}$和$Ω_{r_c}=0.000^{+0.014}$。在68.3%的置信区间内，本质样品SNIa与CMB位移参数、BAO和重子气体质量分数相对应：$Ω_m= 0.220^{+0.020}_{-0.170}$和$Ω_{r_c}=0.000^{+0.025}$。我们通过使用这些最佳拟合值来确定宇宙的年龄。我们还通过一个有效的状态方程参数和减速参数研究了膜上的有效宇宙动力学，得出结论，在这种情况下，一个有效的幻影般的行为出现。
英文摘要：
We investigate observational constraints on the normal branch of the warped DGP braneworld cosmology by using observational data from Type Ia Supernovae (SNIa), Baryon Acoustic Oscillations (BAO), Cosmic Microwave Background (CMB) and Baryon Gas Mass Fraction of cluster of galaxies. The best fit values of model free parameters are: $Ω_m=0.240^{+0.050}_{-0.130}$ and $Ω_{r_c}=0.000^{+0.014}$ at $1σ$ confidence interval by using Gold sample SNIa+CMB shift parameter+BAO+Gas mass fraction of baryons in cluster of galaxies. The results for essence sample SNIa combined with CMB shift parameter, BAO and Baryon Gas mass fraction correspont to: $Ω_m= 0.220^{+0.020}_{-0.170}$ and $Ω_{r_c}=0.000^{+0.025}$ at 68.3% confidence interval. We determine the age of the universe by using these best fit values. We also study the effective cosmological dynamics on the brane via an effective equation of state parameter and the deceleration parameter to conclude that an effective phantom-like behavior arises in this scenario.
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