论文标题
弦宇宙学的Dilaton轴模型
A dilaton-axion model for string cosmology
论文作者
论文摘要
在$ d $ dimensions中耦合到重力的轴突和diLATON的通用标度不变理论被推广到一个“通用”的单轴模型，其中有两个dialatons在一致的尺寸还原/截断下自身再现自身。表现出平坦的FLRW宇宙学对应于三维自主动力系统的轨迹，我们以此为重点进行分析，重点是加速的宇宙膨胀，从而得出了排除永恒加速的精确swampland边界。我们还表明，对于其三个独立参数的两组值，该模型是由字符串/M理论引起的最大“大型”超级重力理论的一致截断。对于这些最大杀菌性参数值，FLRW宇宙学包括一些具有瞬态DE Sitter样相，但不具有反复出现的De Sitter样相或永恒的宇宙加速度，这是其他参数值的可能性。
The generic scale-invariant theory of an axion and a dilaton coupled to gravity in $d$-dimensions is generalized to a `universal' one-axion model with two dilatons that reproduces itself under consistent dimensional-reduction/truncation. Flat FLRW cosmologies are shown to correspond to trajectories of a three-dimensional autonomous dynamical system, which we analyse with a focus on accelerated cosmic expansion, deriving the precise swampland bounds that exclude eternal acceleration. We also show that for two sets of values of its three independent parameters, the model is a consistent truncation of maximal `massive' supergravity theories arising from string/M-theory; for these maximal-supergravity parameter values the FLRW cosmologies include some with a transient de Sitter-like phase, but not the recurring de Sitter-like phase or eternal cosmic acceleration that is possible for other parameter values.
