论文标题
Swampland猜想和宇宙学扩展
Swampland Conjectures and Cosmological Expansion
论文作者
论文摘要
字符串理论的Swampland猜想（SC）要求恒定的宇宙常数$λ$被带有约束参数的时间依赖性标量领域的典范代替。约束限制了当前扩展时代的持续时间，因为尽管可以在当前实现SC，但将来将在有限的时间内违反它们，仅允许订购一项订单数量的电子折叠数。相比之下，循环宇宙学需要$ \ sim94 $ e折叠在从扩展到收缩的周转之前。这给原始SCS带来了困境。一种可能性是SCS之一，范围的猜想是显着削弱的。难以置信的第二种可能性是，环状宇宙学大大高估了电子折叠的数量。第三种可能性是最不明式的可能性，是弦理论不是量子引力的正确理论。
Swampland conjectures (SCs) of string theory require that a constant cosmological constant $Λ$ be replaced by a time-dependent scalar-field quintessence with constrained parameters. The constraints limit the duration of the present expansion era because, although the SCs may be fulfilled at the present time, they will be violated at a finite time in the future allowing only an order-one number of e-foldings. In contrast, cyclic cosmology requires $\sim94$ e-foldings of the present universe before turnaround from expansion to contraction. This presents a dilemma to the original SCs. One possibility is that one of the SCs, the range conjecture, be significantly weakened. A second possibility, difficult to believe, is that cyclic cosmology vastly overestimates the number of e-foldings. A third possibility, which is the least disfavoured, is that string theory is not the correct theory of quantum gravity.
