两个参数模型的诊断和未来演变分析
Diagnostics and future evolution analysis of the two parametric models
摘要:
本文利用$Om$、Statefinder层次和扰动增长率三种诊断方法,对$Λ$ CDM模型中的两种有效压力参数模型进行了判别。通过使用$Om$诊断,我们发现,在68\%的置信水平下,模型1和模型2以及$Λ$ CDM模型几乎不能彼此区分。作为补充,利用Statefinder层次诊断法和扰动增长率,我们发现不仅我们的两个参数模型能很好地与$Λ$ CDM模型区分开来,而且通过与$Om$诊断法的比较,模型1和模型2也能更好地区分开来。此外,我们还通过RIP分析探讨了两个模型的宇宙演化命运。
英文摘要:
In this paper, we apply three diagnostics including $Om$, Statefinder hierarchy and the growth rate of perturbations into discriminating the two parametric models for the effective pressure with the $Λ$CDM model. By using the $Om$ diagnostic, we find that both the model 1 and the model 2 can be hardly distinguished from each other as well as the $Λ$CDM model in terms of 68\% confidence level. As a supplement, by using the Statefinder hierarchy diagnostics and the growth rate of perturbations, we discover that not only can our two parametric models be well distinguished from $Λ$CDM model, but also, by comparing with $Om$ diagnostic, the model 1 and the model 2 can be distinguished better from each other. In addition, we also explore the fate of universe evolution of our two models by means of the rip analysis.
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