Eternal inflation in swampy landscapes

Eternal inflation in swampy landscapes
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沼泽地貌中的永恒膨胀

DOI:
10.1088/1475-7516/2020/05/014
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发表时间:
2020
影响因子:
6.4
通讯作者:
Vilenkin, Alexander
Vilenkin, Alexander
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Blanco-Pillado, Jose J.;Deng, Heling;Vilenkin, Alexander

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被广泛讨论的沼泽地景观,对弦论景观的性质和这个景观所能支持的多元宇宙的性质提出了重大的限制。这些定理对暴胀模型特别有限制,特别是它们排除了德西特真空的存在。如果这些假设是假的,dS真空确实存在,那么在弦理论中构造它们仍然需要相当多的微调,所以它们的数量可能远远超过AdS真空。在这里,我们探讨这些考虑所建议的多元宇宙结构。我们考虑两种情况:(一)景观的dS真空是罕见的,(二)景观的dS真空不存在和dS潜在的最大值和鞍点不够平坦,以允许通常的山顶通货膨胀,即使慢卷通货膨胀是可能的斜坡上的潜力。我们认为,在这两种情况下,通货膨胀都是永恒的,可以支持通货膨胀的景观的所有部分都在多元宇宙中表现出来。在这样的模型中,多重宇宙的时空结构是非平凡的,与标准的图像有很大的不同。
The much discussed swampland conjectures suggest significant constraints on the properties of string theory landscape and on the nature of the multiverse that this landscape can support. The conjectures are especially constraining for models of inflation; in particular, they exclude the existence of de Sitter (dS) vacua. If the conjectures are false and dS vacua do exist, it still appears that their construction in string theory requires a fair amount of fine-tuning, so they may be vastly outnumbered by AdS vacua. Here we explore the multiverse structure suggested by these considerations. We consider two scenarios:(i) a landscape where dS vacua are rare and (ii) a landscape where dS vacua do not exist and the dS potential maxima and saddle points are not flat enough to allow for the usual hilltop inflation, even though slow roll inflation is possible on the slopes of the potential. We argue that in both scenarios inflation is eternal and all parts of the landscape that can support inflation get represented in the multiverse. The spacetime structure of the multiverse in such models is nontrivial and is rather different from the standard picture.
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