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arXiv 2202.06194gr-qc
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如果一个标量场要统一暴胀和晚期加速,它需要什么?

What is needed of a scalar field if it is to unify inflation and late time acceleration ?

Nur Jaman, M. Sami

摘要:

典型暴胀是指使用单个标量场来描述暴胀和后期加速的场景。这篇评论致力于典型通货膨胀的框架,重点是形式主义的基石。一致的统一的通货膨胀和后期的时间加速使用一个单一的标量场要求一个浅场电位最初其次是陡峭的行为之后,浅再次围绕本时代。标量场不干扰热历史的要求决定了后暴胀时代势的陡峭性质,并进一步限制了后期物理与初始条件无关。我们详细描述了标度和渐近标度解以及从标度区退出到后期加速的机制。审查包括重新审视缩放解决方案,这是通货膨胀和后期加速统一的主题的核心。在退出机制方面,我们特别注意了大质量中微子物质与标量场的耦合,这种耦合是动态建立的,可以引起后期的加速。本文给出了耦合情况下标量场动力学的详细解析处理。我们简要地讨论了典型暴胀的显著特征,即从暴胀到动力学状态过渡期间产生的重力波的蓝色光谱。

英文摘要:

Quintessential inflation refers to scenarios in which a single scalar field is used to describe inflation and late-time acceleration. This review is dedicated to the framework of quintessential inflation, with a focus on the building blocks of formalism. Consistent unification of inflation and late time acceleration using a single scalar field asks for a shallow field potential initially followed by steep behaviour thereafter and shallow again around the present epoch. The requirement of non-interference of scalar field with thermal history dictates steep nature of potential in the post-inflationary era, with a further restriction that late time physics be independent of initial conditions. We describe, in detail the scaling and asymptotic scaling solutions and the mechanism of exit from the scaling regime to late time acceleration. Review includes a fresh look at scaling solutions which are central to the theme of unification of inflation and late time acceleration. As for the exit mechanism, special attention is paid to the coupling of massive neutrino matter to the scalar field, which builds up dynamically and can give rise to late time acceleration. We present a detailed analytical treatment of scalar field dynamics in the presence of coupling. We briefly discuss the distinguished feature of quintessential inflation, namely, the blue spectrum of gravity waves produced during the transition from inflation to the kinetic regime.

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