We perform a detailed study of stringy moduli-driven cosmologies between the end of inflation and the commencement of the Hot Big Bang, including both the background and cosmological perturbations: a period that can cover half the lifetime of the universe on a logarithmic scale. Compared to the standard cosmology, stringy cosmologies with vacua that address the hierarchy problem motivate extended kination, tracker and moduli-dominated epochs involving significantly trans-Planckian field excursions. We analyse the cosmology within the framework of the Large Volume Scenario but explain how analogous cosmological features are expected in other string theory models characterized by final vacua located in the asymptotic regions of moduli space. Conventional effective field theory is unable to control Planck-suppressed operators and so such epochs require a stringy completion for a consistent analysis. Perturbation growth in these stringy cosmologies is substantially enhanced compared to conventional cosmological histories. The transPlanckian field evolution results in radical changes to Standard Model couplings during this history and we outline potential applications to baryogenesis, dark matter and gravitational wave production.

中文翻译：

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弦理论和宇宙的前半部分


我们对暴胀结束和热大爆炸开始之间的弦模驱动宇宙学进行了详细研究，包括背景和宇宙扰动：这个时期可以在对数尺度上覆盖宇宙寿命的一半。与标准宇宙学相比，解决层次结构问题的真空弦宇宙学激发了扩展的运动、跟踪和模主导的时代，涉及显着的跨普朗克场偏移。我们在大体积场景的框架内分析宇宙学，但解释了如何在以位于模空间渐近区域的最终真空为特征的其他弦理论模型中预期类似的宇宙学特征。传统的有效场理论无法控制普朗克抑制算子，因此这样的历元需要严格的完成才能进行一致的分析。与传统宇宙学历史相比，这些弦宇宙学中的扰动增长大大增强。跨普朗克场演化导致了这段历史中标准模型耦合的根本变化，我们概述了重子发生、暗物质和引力波产生的潜在应用。