arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.06601gr-qcastro-ph.CO
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从暴胀到标量张量宇宙学中的暗能量

From inflation to dark energy in scalar-tensor cosmology

Jibitesh Dutta, Laur Jarv, Wompherdeiki Khyllep, Sulev Tokke

摘要:

动力系统的方法在宇宙学中有着广泛的应用,其研究重点要么是暴胀,要么是进入暗能量时代。在本文中,我们努力捕捉到一个动力学系统的宇宙的整个历史,考虑一般的标量张量引力与辐射和尘埃物质流体在平坦的Friedmann-Lemaitre-Robertson-Walker时空。我们构造动力学变量的方式,宇宙演化的主要阶段,即暴胀,辐射统治,物质统治,和暗能量统治可以表示为各自的不动点在相空间。由于解的演化是由这些具有适当性质的不动点的序列决定的,我们可以确定标量势和非最小耦合必须满足的条件,以使模型以通用的方式提供可行的宇宙历史。我们用一个具有四次势的标量场来说明这个结构,其中有和没有二次非最小曲率耦合。

英文摘要:

The methods of dynamical systems have found wide applications in cosmology, with focus either upon inflation or upon the passage into dark energy era. In this paper, we endeavor to capture the whole history of the universe into a dynamical system by considering generic scalar tensor gravity with radiation and dust matter fluids in flat Friedmann-Lemaitre-Robertson-Walker spacetime. We construct the dynamical variables in such a way that the main stages of the cosmic evolution, viz. inflation, radiation domination, matter domination, and dark energy domination can be represented by the respective fixed points in the phase space. As the evolution of solutions is ruled by the sequence of these fixed points with appropriate properties, we can determine the conditions that the scalar potential and nonminimal coupling must satisfy for the model to deliver viable cosmic history in a generic manner. We illustrate the construction by a scalar field with quartic potential, with and without quadratic nonminimal coupling to curvature.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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