论文标题
一类可改变签名的相互作用的黑暗能源场景的动力和状态得分分析
Dynamics and statefinder analysis of a class of sign-changeable interacting dark energy scenarios
论文作者
论文摘要
我们修改了一类宇宙学模型的动力学特性，其中黑暗扇区通过相互作用的术语相互作用，该术语在进化过程中会改变符号。特别是，我们获得了关键点，并研究了宇宙解的存在和稳定条件，描述了辐射，物质和黑暗能量主导的时代。我们发现所有研究的模型都接受了与加速阶段相对应的稳定临界点。我们使用背景数据为一个研究的模型找到最佳拟合参数，从而导致与动态系统分析的结果一致的相互作用参数，并在$1σ$置信度范围内确定符号。我们还计算了状态基的参数，并绘制$ r-q $和$ r-s $ plaes，当我们改变特定模型的相互作用参数时以及我们改变交互情况时，我们会观察到不同的轨迹。从这个意义上讲，我们可以区分模型，包括$λ$ CDM。
We revise the dynamical properties of a class of cosmological models where the dark sector interacts through an interacting term that changes sign during evolution. In particular, we obtain the critical points and we investigate the existence and stability conditions for cosmological solutions, describing radiation, matter and dark energy dominated eras. We find that all the studied models admit a stable critical point corresponding to an accelerated phase. We use background data to find the best fit parameters for one of the studied models, resulting an interacting parameter with a definite sign within $1σ$ confidence level, consistent with the results of the dynamical system analysis. We also compute the statefinder parameters and plot the $r-q$ and $r-s$ planes, where we observe different trajectories when we vary the interaction parameter for a specific model and when we vary the interacting scenario. We can in this sense distinguish among models, including $Λ$CDM.
