论文标题
多场暗能量的宇宙学动力学
Cosmological dynamics of multifield dark energy
论文作者
论文摘要
我们在数值和分析上探讨了具有高度非对地或“旋转”场空间轨迹的多场暗能量的背景宇宙学动力学。标准单场典当的这些扩展具有吸引人的理论特征，并且与宇宙标准模型具有可观察到的差异。在宇宙学背景的层面上，我们执行相位空间分析，并在各种初始条件下识别具有延迟加速的近似吸引子。我们专注于两类的田间空间几何形状，我们通过要求可行的延迟加速和缺乏梯度不稳定性以及从DE Sitter Swampland猜想来得出参数空间的界限。
We numerically and analytically explore the background cosmological dynamics of multifield dark energy with highly nongeodesic or "spinning" field-space trajectories. These extensions of standard single-field quintessence possess appealing theoretical features and observable differences from the cosmological standard model. At the level of the cosmological background, we perform a phase-space analysis and identify approximate attractors with late-time acceleration for a wide range of initial conditions. Focusing on two classes of field-space geometry, we derive bounds on parameter space by demanding viable late-time acceleration and the absence of gradient instabilities, as well as from the de Sitter swampland conjecture.
