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arXiv 2206.02130gr-qcastro-ph.COhep-th
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在$F(R)$引力的$R^2$修正暗能量模型中对早期宇宙的统一解释

Towards a unified interpretation of the early Universe in $R^2$-corrected dark energy model of $F(R)$ gravity

Hua Chen, Taishi Katsuragawa, Shinya Matsuzaki

摘要:

近年来,$F(R)$引力中的$R^2$修正的暗能量(DE)模型得到了广泛的研究,它不仅消除了DE模型中可能存在的弱奇异性,而且为我们提供了一个统一的宇宙历史图像,包括暴胀和DE时代。为了在$R^2$修正的DE模型类中统一解释整个宇宙历史中的动力学DE,我们通过关注暴胀和DE时期,探索辐射主导时期标量子动力学的普遍特征,以及变色龙机制。我们证明了在大爆炸核合成(BBN)之前,标量子的演化不遵循\textit{surfing solution},并且基本上是绝热的,甚至通过非微扰QCD相变适当地包含了\textit{kick},因此文献中所声称的灾难性结果并不适用于这类DE模型.这是由于在$R^2$校正和DE之间存在巨大的尺度层次结构,因此是$R^2$校正的DE模型类的普遍特征。由于变色龙机制的存在,暴胀后或暴胀开始时期的前景将与标准的$R^2$暴胀情景大不相同。

英文摘要:

$R^2$-corrected dark energy (DE) models in $F(R)$ gravity have been widely investigated in recent years, which not only removes the weak singularity potentially present in DE models but also provide us with a unified picture of the cosmic history, including the inflationary and DE epochs. Towards the unified interpretation of dynamical DE all over the cosmic history in the class of $R^2$-corrected DE models, we explore the universal features of the scalaron dynamics in the radiation-dominated epoch, along with the chameleon mechanism, by keeping our eyes on the inflationary and DE epochs. We show that the scalaron evolution does not follow a \textit{surfing solution} and is mostly adiabatic before big bang nucleosynthesis (BBN), even properly including the \textit{kick} by the nonperturbative QCD phase transition, hence a catastrophic consequence claimed in the literature is not applied to this class of DE models. This is due to the presence of the gigantic scale hierarchy between $R^2$ correction and DE, so is the universal feature for the class of $R^2$-corrected DE models. The prospects for the post- or onset-inflationary epoch would be pretty different from what the standard $R^2$ inflationary scenario undergoes due to the presence of the chameleon mechanism.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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