论文标题
弹跳后背景动态的注释
Notes on the post-bounce background dynamics in bouncing cosmologies
论文作者
论文摘要
我们研究了文献中研究的某些单一弹跳场景中的反弹后背景动力学，其中宇宙反弹是由具有负指数潜力的标量场驱动的，例如ekpyrotic势。我们表明，这些模型实际上可以导致反复反弹的环状演变。但是，这些环状演变并未考虑当前观察到的延迟加速扩张，因此在宇宙学上不可行。在这方面，我们考虑了最近提出的一种新型的循环模型，并在该模型上得出了一些宇宙学的约束。
We investigate the post-bounce background dynamics in a certain class of single bounce scenarios studied in the literature, in which the cosmic bounce is driven by a scalar field with negative exponential potential such as the ekpyrotic potential. We show that those models can actually lead to cyclic evolutions with repeated bounces. These cyclic evolutions, however, do not account for the currently observed late-time accelerated expansion and hence are not cosmologically viable. In this respect we consider a new kind of cyclic model proposed recently and derive some cosmological constraints on this model.
