Age problem in the creation cold dark matter cosmology model
Age problem in the creation cold dark matter cosmology model
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DOI：
10.1140/epjc/s10052-012-1861-0
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发表时间：
2012-02
期刊：
影响因子：
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通讯作者：
Jun Chen;Puxun Wu;Hongwei Yu;Zhengxiang Li
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文献类型：
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作者：
Jun Chen;Puxun Wu;Hongwei Yu;Zhengxiang Li
冷暗物质（CCDM）的产生可以解释目前加速的宇宙膨胀，而无需诉诸暗能量。本文研究了5个老高红移天体（老比星系3C 65、老星系LBDS 53W 069、老星系LBDS 53W 091、高红移类星体B1422+231、老类星体APM 08279+5255）的CCDM模型的年龄问题。两个具体的CCDM模型，即，LSS和LJO。利用最近的SNIa、BAO和H（z）观测数据来约束模型参数，我们可以用模型参数的最佳拟合值来估计宇宙年龄。通过与OHRO年龄的比较发现，对于LSS，在相同红移下，五个OHRO的年龄都小于宇宙年龄，而对于LJO，这一结论敏感地依赖于APM 08279+5255的年龄值和H0的值。因此，为了确定LJO是否存在年龄问题，我们需要更精确的APM 08279+5255的年龄和当前哈勃参数的值。
The creation of cold dark matter (CCDM) can explain the present accelerating cosmic expansion without appealing to dark energy. In this paper, we investigate the age problem of CCDM models by considering five old high redshift objects (OHROs) (old ratio galaxy 3C 65, old galaxy LBDS 53W069, old galaxy LBDS 53W091, high redshift quasar B1422+231, old quasar APM 08279+5255). Two concrete CCDM models, i.e., the LSS and the LJO, are studied. Using the recent SNIa, BAO andH(z) observational data to constrain the model parameters, we can estimate the cosmic age with the model parameters that are their best fit values. By comparing the estimated cosmic age with the age of OHROs, we find that for the LSS, the ages of five OHROs are less than the cosmic age at the same redshift, while for the LJO, the conclusion depends sensitively on both the value for the age of APM 08279+5255 and the value ofH0. So, to determine whether the age problem exists for the LJO, we need more precise results on the age of APM 08279+5255 and the value of the present Hubble parameter.