论文标题
宇宙加速度和埃克比式反弹与变色龙场
Cosmic acceleration and ekpyrotic bounce with Chameleon field
论文作者
论文摘要
在本文中，我们探讨了变色龙宇宙学中的均质和各向同性扁平弗里德曼·罗伯逊·沃克（FRW）模型。通过考虑标量场和物质之间的非最小耦合，我们提出了宇宙的非偏跳宇宙学场景。宇宙最初表现出在缩合时代的ekpyrotic阶段，经历了非单明一向的弹跳，然后在不断扩展的时代，它平稳地转移到具有物质和辐射占主导阶段的减速时代。此外，这个减速时代与当前时代的晚期黑暗能源主导的时代相连。我们使用数值溶液技术来求解非最少耦合的重力方程，以理解标量场的演变以及其他数量（例如模型中的有效电位）。因此，该模型与当前时期的暗能量时代统一了ekpyrototic，非单一的，不对称的弹跳。我们研究了弹跳模型的演变，并通过约束模型参数来与模型对状态参数方程进行观察结果。
In this article, we explore the homogeneous and isotropic flat Friedmann-Robertson-Walker (FRW) model in Chameleon cosmology. By considering a non-minimal coupling between the scalar field and matter, we present a non-singular bouncing cosmological scenario of the universe. The universe initially exhibits the ekpyrotic phase during the contracting era, undergoes a non-singular bounce, and then in expanding era, it smoothly transits to the decelerating era having matter and radiation dominated phases. Further, this decelerating era is smoothly connected to the late-time dark energy-dominated era of the present epoch. We use numerical solution techniques to solve non-minimally coupled gravity equations for understanding the evolution of scalar field along with other quantities like effective potential in the model. The model thus unifies an ekpyrotic, non-singular, asymmetric bounce with the dark energy era of the present epoch. We study the evolution of bouncing model and confront the model with observational results on the equation of state parameter by constraining the model parameters.
