相互作用暗能量模型中宇宙年龄问题的缓解
Alleviation of Cosmic Age Problem In Interacting Dark Energy Model
摘要：
研究了$Λ$ CDM模型难以容纳的老高$z$类星体APM 08279 + 5255和最老球状星团M 107的宇宙年龄问题。通过评估宇宙的年龄在一个模型中，有一个非常幻影一样的形式的暗能量（DE），我们表明，简单地引入暗能量单独并不能解决这个问题，和暗物质（DM）和DE之间的相互作用需要考虑。接下来，作为例子，我们考虑两个相互作用的DE模型。结果表明，在任意红移处，这两个相互作用的DE模型都能预言比$Λ$ CDM模型大得多的宇宙年龄，从而大大缓解了宇宙年龄问题。因此，DM和DE之间的相互作用是使预测的宇宙年龄与观测一致的关键因素。
英文摘要：
We investigate the cosmic age problem associated with the old high-$z$ quasar APM 08279 + 5255 and the oldest globular cluster M 107, both being difficult to accommodate in $Λ$CDM model. By evaluating the age of the Universe in a model that has an extremely phantom like form of dark energy (DE), we show that simply introducing the dark energy alone does not remove the problem, and the interaction between dark matter (DM) and DE need to be taken into account. Next, as examples, we consider two interacting DE models. It is found that both these two interacting DE Models can predict a cosmic age much greater than that of $Λ$CDM model at any redshift, and thus substantially alleviate the cosmic age problem. Therefore, the interaction between DM and DE is the crucial factor required to make the predicted cosmic ages consistent with observations.
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