论文标题
来自能量摩托明平方重力的新兴宇宙
Emergent Universe from Energy-Momentum Squared Gravity
论文作者
论文摘要
为了绕过大爆炸奇异性，我们在称为\ emph {“ energy-momentum squared gravity”}的一般相对性的协变延伸中发展出了新兴的宇宙场景。该模型的额外术语在高能制度中出现。考虑在弗里德曼 - 罗马 - 罗伯逊步行者背景中的动力学，临界点，代表相位空间的稳定爱因斯坦静态状态，作为解决方案。然后事实证明，随着状态参数$ω$的方程式从恒定值逐渐下降为$ t \ rightarrow- \ infty $，最终，一些静态的过去的永恒解决方案找到了通过优雅的退出机制自然进入热历史的机会。这样，新兴宇宙的成功实现就可以扩大热历史，而没有大爆炸奇异性，对于没有宇宙学常数的空间平坦宇宙。
In order to bypass the big bang singularity, we develop an emergent universe scenario within a covariant extension of General Relativity known as \emph{"Energy-Momentum Squared Gravity"}. The extra terms of the model emerge in the high energy regime. Considering dynamics in a Friedmann-Lemaître-Robertson-Walker background, critical points, representing stable Einstein static states of the phase space, result as solutions. It then turns out that as the equation of state parameter $ω$ gradually declines from a constant value as $t\rightarrow-\infty$, eventually some of the static past eternal solutions find the chance to naturally enter into thermal history through a graceful exit mechanism. In this way, the successful realization of the emergent universe allows an expanding thermal history without the big bang singularity for the spatially flat universe free of cosmological constant.
