在Chern-Simons F（R）引力中统一非对称反弹到暗能量
Unifying an asymmetric bounce to the dark energy in Chern-Simons F(R) gravity
摘要：
我们提出了一个宇宙学方案，其中宇宙经历了一个非奇异的反弹，反弹后，它减速有一个物质主导的演化在减速时代的一些制度，并最终在目前的时代，它通过一个加速阶段的演变。我们的目标是在Chern-Simons修正的F（R）引力理论的背景下研究这种演化，并用各种观测数据对抗模型。使用重建技术，并通过采用适当的边界条件，我们确定的形式F（R）的宇宙时间的整个可能的范围。F（R）的形式似乎将非奇异反弹与暗能量时期统一起来，特别是从非奇异反弹到减速时期和从减速时期到后期加速时期。值得一提的是，在目前的情况下，反弹的情况是一个不对称的反弹，特别是，哈勃半径单调增加，并在后期收缩时代渐近发散，而它似乎随着时间的推移在目前的时代减少。哈勃半径的这种演化导致了原始微扰模在深收缩时期产生，此时所有的微扰模都位于视界内。我们计算了标量和张量功率谱，结果发现原始观测量与最新的普朗克2018约束一致。在这方面，Chern-Simons项似乎对张量扰动的演化有相当大的影响，但要保持微扰的标量部分与真空F（R）模型的标量部分相同，因此，Chern-Simons项在使可观测量与Planck结果一致方面起着重要的作用。此外，用Planck+SNe+BAO观测数据对暗能量观测值的理论预期进行了验证。
英文摘要：
We propose a cosmological scenario in which the universe undergoes through a non-singular bounce, and after the bounce, it decelerates having a matter-like dominated evolution during some regime of the deceleration era, and finally at the present epoch it evolves through an accelerating stage. Our aim is to study such evolution in the context of Chern-Simons corrected F(R) gravity theory and confront the model with various observational data. Using the reconstruction technique, and in addition by employing suitable boundary conditions, we determine the form of F(R) for the entire possible range of the cosmic time. The form of F(R) seems to unify a non-singular bounce with a dark energy epoch, in particular, from a non-singular bounce to a deceleration epoch and from a deceleration epoch to a late time acceleration era. It is important to mention that the bouncing scenario in the present context is an asymmetric bounce, in particular, the Hubble radius monotonically increases and asymptotically diverges at the late contracting era, while it seems to decrease with time at the present epoch. Such evolution of the Hubble radius leads to the primordial perturbation modes generate at the deep contracting era when all the perturbation modes lie within the horizon. We calculate the scalar and tensor power spectra, and as a result, the primordial observables are found to be in agreement with the latest Planck 2018 constraints. In this regard, the Chern-Simons term seems to have considerable effects on the tensor perturbation evolution, however keeping intact the scalar part of the perturbation with that of in the case of a vacuum F(R) model, and as a result, the Chern-Simons term proves to play an important role in making the observable quantities consistent with the Planck results. Furthermore the theoretical expectation of the dark energy observables are confronted with the Planck+SNe+BAO data.
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