Latest cosmological constraints on Cardassian expansion models including the updated gamma-ray bursts
Latest cosmological constraints on Cardassian expansion models including the updated gamma-ray bursts
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DOI：
10.1088/1674-4527/11/9/002
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发表时间：
2010-06
影响因子：
1.8
通讯作者：
N. Liang;Puxun Wu;Zong-hong Zhu
中科院分区：
文献类型：
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作者：
N. Liang;Puxun Wu;Zong-hong Zhu
我们根据最新的观测结果来约束卡达西膨胀模型，包括更新的伽马射线爆发（GRB），这些模型是使用来自 Ia 型超新星（SNe Ia）的 Union2 汇编的宇宙学独立方法进行校准的。将GRB数据与Union2超新星Ia组联合观测数据、威尔金森微波各向异性探测器七年宇宙微波背景辐射观测结果以及光谱斯隆数字巡天数据发布的重子声振荡观测星系样本相结合，我们发现原始卡达西模型的模型参数ΩM0 = 0.282+0.015−0.014，n = 0.03+0.05−0.05；修正多方卡达西模型的 n = −0.16+0.25−3.26，β = 0.76+0.34−0.58，与 ΛCDM 模型在 1-σ 置信区域一致。从 Cardassian 模型中减速参数 q(z) 的重构中，我们得到原始 Cardassian 模型的过渡红移 zT = 0.73 ± 0.04，以及修改后的多变 Cardassian 模型的 zT = 0.68 ± 0.04。
We constrain the Cardassian expansion models from the latest observations, including the updated Gamma-ray bursts (GRBs), which are calibrated using a cosmology independent method from the Union2 compilation of type Ia supernovae (SNe Ia). By combining the GRB data with the joint observations from the Union2 SNe Ia set, along with the results from the Cosmic Microwave Background radiation observation from the seven-year Wilkinson Microwave Anisotropy Probe and the baryonic acoustic oscillation observation galaxy sample from the spectroscopic Sloan Digital Sky Survey Data Release, we find significant constraints on the model parameters of the original Cardassian model ΩM0 = 0.282+0.015−0.014, n = 0.03+0.05−0.05; and n = −0.16+0.25−3.26, β = 0.76+0.34−0.58 of the modified polytropic Cardassian model, which are consistent with the ΛCDM model in a 1-σ confidence region. From the reconstruction of the deceleration parameter q(z) in Cardassian models, we obtain the transition redshift zT = 0.73 ± 0.04 for the original Cardassian model and zT = 0.68 ± 0.04 for the modified polytropic Cardassian model.