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arXiv 2204.12909astro-ph.COgr-qchep-ph
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$α$ -吸引子模型中的（P）再加热和引力波

(P)reheating and gravitational waves in $α$-attractor models

Tomasz Krajewski, Krzysztof Turzyński

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摘要：

研究了$α$ -吸引子T-暴胀模型的后暴胀演化。我们认为在这些模型中存在的标量场的动力学：暴胀子和观众，作为一个负的场空间曲率可能会导致几何不稳定的观众。我们使用针对这些模型优化的专用数值代码进行最先进的晶格模拟。我们证实了早期的研究结果，观众场的扰动比暴胀子场的扰动更不稳定，所以预热的早期阶段的动态是由观众扰动的演变。我们还计算了起源于标量涨落的引力波的谱，以确定$α$吸引子T模型是否可以被目前的宇宙学观测所约束甚至排除，而不是直接搜索引力波。

英文摘要：

We study post-inflationary evolution in $α$-attractor T-models of inflation. We consider the dynamics of both scalar fields present in these models: the inflaton and the spectator, as a negative field-space curvature may lead to geometrical destabilization of the spectator. We perform state-of-the-art lattice simulations with a dedicated numerical code optimized for those models. We corroborate earlier findings that the perturbations of the spectator field are much more unstable than the perturbations of the inflaton field, so the dynamics of early stages of preheating is dominated by the evolution of spectator perturbations. We also calculate the spectrum of gravitational waves originating from scalar fluctuations in order to determine if the $α$-attractor T-models can be constrained or even ruled out by present cosmological observations, but not by direct searches of gravitational waves.

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