论文标题

普遍的新兴深色能量:观察性哈勃数据约束和稳定性分析

Generalized Emergent Dark Energy: observational Hubble data constraints and stability analysis

论文作者

Hernández-Almada, A., Leon, Genly, Magaña, Juan, García-Aspeitia, Miguel A., Motta, V.

论文摘要

最近\ citet {pede:2019apj}提出了一种现象学上新兴的黑暗能量(PEDE),它认为黑能密度随着$ \widetildeΩ_ {\ rm {\ rm {de}}}(z)\,= \,= \,ω_ {\ rm { {\ rm {tanh}} \ left({\ log} _ {10}(1+z)\ right)\ right] $] \ right] $,其优势是它没有自由度。后来,\ citet {pede:2020}提出了一个广义模型,通过在pede模型中添加一个自由度,该模型在参数$δ$中编码。在这些建议的激励下,我们分别使用最新的观察(非 - 非)同质性Hubble数据来限制PEDE和广义的新兴暗能量(GEDE)的参数空间($ h,ω_m$)和($ h,ω_m,δ$)。此外,我们重建减速和混蛋参数,并估算收益率值为$ z = 0 $ of $ q_0 = -0.784^{+0.028} _ { - 0.027} $和$ j_0 = 1.241 = 1.241^{+0.164} -0.730^{+0.059} _ { - 0.067} $和$ j_0 = 1.293^{+0.194} _ { - 0.187} $用于Gede使用均匀样品。我们报告了对减速加速过渡红移的值,文献中报告的价值超过$2σ$ cl。此外,我们对PEDE和GEDE模型进行稳定分析,以研究宇宙围绕其关键点的全球演变。尽管PEDE和GEDE动力学与标准模型相似,但我们的稳定性分析表明,在这两个模型中,在宇宙的早期时期都有一个加速阶段。

Recently \citet{PEDE:2019ApJ} proposed a phenomenologically emergent dark energy (PEDE) which consider that the dark energy density evolves as $\widetildeΩ_{\rm{DE}}(z)\,=\,Ω_{\rm{DE,0}}\left[ 1 - {\rm{tanh}}\left( {\log}_{10}(1+z) \right) \right]$ with the advantage that it does not have degree of freedom. Later on, \citet{PEDE:2020} proposed a generalized model by adding one degree of freedom to the PEDE model, encoded in the parameter $Δ$. Motivated by these proposals, we constrain the parameter space ($h,Ω_m$) and ($h,Ω_m, Δ$) for PEDE and Generalized Emergent Dark Energy (GEDE) respectively, by employing the most recent observational (non-) homogeneous Hubble data. Additionally, we reconstruct the deceleration and jerk parameters and estimate yield values at $z=0$ of $q_0 = -0.784^{+0.028}_{-0.027}$ and $j_0 = 1.241^{+0.164}_{-0.149}$ for PEDE and $q_0 = -0.730^{+0.059}_{-0.067}$ and $j_0 = 1.293^{+0.194}_{-0.187}$ for GEDE using the homogeneous sample. We report values on the deceleration-acceleration transition redshift with those reported in the literature within $2σ$ CL. Furthermore, we perform a stability analysis of the PEDE and GEDE models to study the global evolution of the Universe around their critical points. Although the PEDE and GEDE dynamics are similar to the standard model, our stability analysis indicates that in both models there is an accelerated phase at early epochs of the Universe.

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