Superacceleration as the signature of a dark sector interaction
Superacceleration as the signature of a dark sector interaction
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DOI：
10.1103/physrevd.73.083509
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发表时间：
2005-10
影响因子：
5
通讯作者：
Subinoy Das;Pier Stefano Corasaniti;J. Khoury
中科院分区：
文献类型：
--
作者：
Subinoy Das;Pier Stefano Corasaniti;J. Khoury
我们表明，暗物质和暗能量之间的相互作用一般导致一个有效的暗能量状态方程w<-1。这是因为相互作用改变了物质密度对红移的依赖性。如果观测者将暗物质视为非相互作用的，那么他将推断出一种w<-1的有效暗能量流体。我们认为，该模型是符合所有目前的观察，最严格的约束来自不同的红移的物质密度的估计。比较{lambda}CDM和幻影模型的光度和角直径距离关系，我们发现，这三个模型是退化在当前的不确定性，但可能区分的下一代暗能量实验。
We show that an interaction between dark matter and dark energy generically results in an effective dark-energy equation of state of w<-1. This arises because the interaction alters the redshift dependence of the matter density. An observer who fits the data treating the dark matter as noninteracting will infer an effective dark-energy fluid with w<-1. We argue that the model is consistent with all current observations, the tightest constraint coming from estimates of the matter density at different redshifts. Comparing the luminosity and angular-diameter distance relations with {lambda}CDM and phantom models, we find that the three models are degenerate within current uncertainties but likely distinguishable by the next generation of dark-energy experiments.