标题： 吸引子轴子：模空间边界的宇宙学追踪者 显示英文标题

标题： Attractive (s)axions: cosmological trackers at the boundary of moduli space

摘要： 我们研究了在模场能量密度主导的FLRW宇宙在模场空间渐近区域附近的宇宙学演化。 由于$\mathcal{N}=1$SUGRA动能项的结构，位于同一手征多重态中的saxion和axion即使后者是势能的平坦方向也会（普遍地）耦合，导致非平凡的动力学。 我们将文献中已知的结果推广到多个模场的情况，表明存在各种“跟踪”吸引子解，在整个演化过程中许多组分（包括axion）的相对能量密度保持固定比例。 我们最后给出一些现象学应用，这些应用对于早期和晚期宇宙都是相关的。 显示英文摘要

摘要： We study the cosmological evolution of a FLRW universe dominated by the energy density of moduli close to asymptotic regions of moduli space. Due to the structure of the $\mathcal{N}=1$ SUGRA kinetic term, a saxion and an axion residing in the same chiral multiplet are (universally) coupled even if the latter is a flat direction of the potential, resulting in non-trivial dynamics. We generalise known results in the literature to the case of multiple moduli, showing the existence of various ``tracker" attractor solutions where the relative energy densities of many components (axions included) stay in a fixed ratio throughout the evolution. We conclude with some phenomenological applications, relevant for both the early and late universe.