论文标题
挑选或幻影：通过哈勃参数的一般参数化对标量场暗能量模型的研究
Quintessence or Phantom: Study of scalar field dark energy models through a general parametrization of the Hubble parameter
论文作者
论文摘要
在这项工作中，我们提出了标量黑暗能量模型的哈勃参数的简单一般参数化方案。在我们的方法中，可以将典型和幻影标量字段同时纳入单个分析方案，并写下与标量场的性质无关的相关宇宙学参数。还获得了幻影屏障交叉的一般条件。为了测试这种方法，已经考虑了归一化哈勃参数的表现良好的参数化，并使用了多种观察数据，例如CMB数据，超新星数据，BAO数据等来限制各种宇宙学参数。已经发现，数据更喜欢黑暗能量状态方程而不是幻影域中。该分析的一个有趣的结果是，尽管状态的暗能量方程的当前值本质上是幻影，但最近过去发生了EOS的幻影交叉。我们还进行了$λCDM$模型和提议的模型之间的贝叶斯模型比较，该模型表明该模型受数据的青睐，而与$λCDM$模型相比。
In this work we propose a simple general parametrization scheme of the Hubble parameter for the scalar field dark energy models. In our approach it is possible to incorporate both the quintessence and phantom scalar field in a single analytical scheme and write down relevant cosmological parameters which are independent of the nature of the scalar field. A general condition for the phantom barrier crossing has also been obtained. To test this approach, a well behaved parametrization of the normalized Hubble parameter has been considered and a wide variety of observational data like CMB data, Supernovae data, BAO data etc. has been used to constraint the various cosmological parameters. It has been found that data prefer the present value of the equation of state of the dark energy to be in the phantom domain. One interesting outcome of this analysis is that although the current value of the dark energy equation of state is phantom in nature, a phantom crossing of the EOS has taken place in the recent past. We have also carried out the Bayesian model comparison between $ΛCDM$ model and the proposed model which indicates that this model is favored by data as compared to $ΛCDM$ model.
