减速DGP引力中的Chaobergin气体和最老恒星的年龄
Chaplygin gas in decelerating DGP gravity and the age of the oldest star
摘要：
加速的Chaubergin气体与减速的膜世界Dvali-Gabadadze-Porrati（DGP）模型相结合，可以产生我们所看到的数量级的整体加速膨胀。这两个模型在宇宙早期和晚期都有相似的渐近性质，并且都具有长度尺度。采取的长度尺度是成比例的一个得到一个组合模型与三个自由参数，一个以上的LCDM模型，它同样适合超新星的数据。我们进一步用宇宙微波背景辐射的位移参数来限制它，并要求模型产生的宇宙年龄比最古老的恒星HE 1523-0901的年龄长，t * = 13.4 \pm 0.8（stat）\pm 1.8（syst）。与广义DGP和Chaubergin气体模型相比，这是一个真正的宇宙学常数模型的替代方案，因为它在参数空间的任何限制下都不会简化为它。
英文摘要：
Accelerating Chaplygin gas combined with the decelerating braneworld Dvali-Gabadadze-Porrati (DGP) model can produce an overall accelerated expansion of the order of magnitude seen. Both models have similar asymptotic properties at early and late cosmic times, and are characterized by a length scale. Taking the length scales to be proportional one obtains a combined model with three free parameters, one more than the LCDM model, which fits supernovae data equally well. We further constrain it by the CMB shift parameter, and by requiring that the model yields a longer age of the Universe than that of the oldest star HE 1523-0901, t * = 13.4\pm 0.8(stat)\pm 1.8(syst). In contrast to generalized DGP and Chaplygin gas models, this is a genuine alternative to the cosmological constant model because it does not reduce to it in any limit of the parameter space.
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