伽马射线暴对卡达西宇宙的约束
Constraints on Cardassian universe from Gamma ray bursts
摘要：
利用最近获得的42个伽马射线暴（GRB）数据，用避免圆度问题的方法，检验了对原有的Cardassian模型和修正的多方Cardassian模型的约束。结果表明，伽玛暴可以作为约束Cardassian模型的一个可选观测量。结合Sloan数字巡天（SDSS）新得到的重子声振荡峰的大小和Wilkinson微波各向异性探测器（WMAP）宇宙微波背景辐射（CMB）第一声峰的位置，我们得到了原始Cardassian模型的$Ω_{m0}=0.27_{-0.02}^{+0.02}, n=0.06_{-0.08}^{+0.07}$（$1σ$）和修正多方Cardassian模型的$Ω_{m0}=0.27^{+0.03}_{-0.02}$，$n=-0.09_{-1.91}^{+0.23}, β=0.82_{-0.62}^{+2.10}$（$1σ$）。
英文摘要：
Constraints on the original Cardassian model and the modified polytropic Cardassian model are examined from the recently derived 42 gamma-ray bursts (GRBs) data calibrated with the method avoiding the circularity problem. The results show that GRBs can be an optional observation to constrain on the Cardassian models. Combining the GRBs data with the newly derived size of baryonic acoustic oscillation peak from the Sloan Digital Sky Survey (SDSS), and the position of first acoustic peak of the Cosmic Microwave Background radiation (CMB) from Wilkinson Microwave Anisotropy Probe (WMAP), we find $Ω_{m0}=0.27_{-0.02}^{+0.02}, n=0.06_{-0.08}^{+0.07}$ ($1σ$) for the original Cardassian model, and $Ω_{m0}=0.27^{+0.03}_{-0.02}$, $n=-0.09_{-1.91}^{+0.23}, β=0.82_{-0.62}^{+2.10}$ ($1σ$) for the modified polytropic Cardassian model.
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