用Lookback时间-红移数据检验（广义）Chaobergin气体模型
Testing the (generalized) Chaplygin gas model with the Lookback time-Redshift data
摘要：
利用回望时间（LT）红移数据检验了Chaubergin气体（CG）和广义Chaubergin气体（GCG）模型，它们被认为是统一的暗物质-暗能量（UDME）模型的候选者.我们发现，LT数据只给出了一个非常弱的约束模型参数。然而，通过结合LT和重子声学振荡峰，我们在95.4%的置信水平上得到了CG模型的$0.68\leq A_c\leq0.82$和$0.59\leq h\leq0.65$，以及GCG模型的$0.67\leq A_s\leq0.89$和$-0.29\leq α\leq0.61$。这表明，CG和GCG都是可行的UDME的候选人。在GCG模型中，我们还发现，Chaubergin气体模型（$α=1$）被排除在这些数据在99.7%的置信水平。
英文摘要：
The Chaplygin gas (CG) and the generalized Chaplygin gas (GCG) models, proposed as candidates of the unified dark matter-dark energy (UDME), are tested with the look-back time (LT) redshift data. We find that the LT data only give a very weak constraint on the model parameter. However, by combing the LT with the baryonic acoustic oscillation peak, we obtain, at the 95.4% confidence level, $0.68\leq A_c\leq0.82$ and $0.59\leq h\leq0.65$ for the CG model, and $0.67\leq A_s\leq0.89$ and $-0.29\leq α\leq0.61$ for the GCG model. This shows that both the CG and the GCG are viable as a candidate of UDME. Within the GCG model, we also find that the Chaplygin gas model ($α=1$) is ruled out by these data at the 99.7% confidence level.
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