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More on the holographic Ricci dark energy model: smoothing Rips through interaction effects?

机译:有关全息Ricci暗能量模型的更多信息:通过交互作用平滑裂口?

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摘要

The background cosmological dynamics of the late Universe is analysed on the framework of a dark energy model described by an holographic Ricci dark energy component. Several kind of interactions between the dark energy and the dark matter components are considered herein. We solve the background cosmological dynamics for the different choices of interactions with the aim to analyse not only the current evolution of the universe but also its asymptotic behaviour and, in particular, possible future singularities removal. We show that in most of the cases, the Big Rip singularity, a finger print of this model in absence of an interaction between the dark sectors, is substituted by a de Sitter or a Minkowski state. Most importantly, we found two new future bouncing solutions leading to two possible asymptotic behaviours, we named Little Bang and Little Sibling of the Big Bang. At a Little Bang, as the size of the universe shrinks to zero in an infinite cosmic time, the Hubble rate and its cosmic time derivative blow up. In addition, at a Little sibling of the Big Bang, as the size of the universe shrinks to zero in an infinite cosmic time, the Hubble rate blows up but its cosmic time derivative is finite. These two abrupt events can happen as well in the past.
机译:在全息里氏暗能量成分描述的暗能量模型的框架下,分析了晚期宇宙的背景宇宙动力学。本文考虑了暗能量和暗物质组分之间的几种相互作用。我们针对相互作用的不同选择解决了背景宇宙动力学,其目的不仅在于分析宇宙的当前演化,还在于分析其渐近行为,尤其是分析未来可能发生的奇点。我们表明,在大多数情况下,Big Rip奇点是该模型的指纹,没有暗区之间的相互作用,被de Sitter或Minkowski状态取代。最重要的是,我们发现了两个新的未来跳动解决方案,它们导致了两种可能的渐近行为,分别命名为“小爆炸”和“大爆炸的小兄弟”。在小爆炸中,随着宇宙的大小在无限的宇宙时间内缩小为零,哈勃速率及其宇宙时间导数会爆炸。另外,在“大爆炸”的小兄弟姐妹中,随着宇宙的大小在无限的宇宙时间内缩小为零,哈勃速率爆炸,但其宇宙时间导数是有限的。这两个突发事件过去也可能发生。

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