Eternal inflation, entropy bounds and the swampland.

Eternal inflation, entropy bounds and the swampland.
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DOI:
10.1140/epjc/s10052-020-8412-x
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发表时间:
2020
期刊:
The European physical journal. C, Particles and fields
影响因子:
--
通讯作者:
Heisenberg L
Heisenberg L
中科院分区:
其他
文献类型:
--
作者:
Wang Z;Brandenberger R;Heisenberg L

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有人建议低能有效场论必须满足一定的条件才能成功地嵌入弦理论。在单个正则规范化纯量场的情况下,这转化为其势及其导数的条件。在这封信中,我们重新审视小领域山顶模型的永恒的通货膨胀,包括随机效应和研究的兼容性的沼泽地的限制熵的考虑。我们发现,这些随机通货膨胀的情况下,要么违反熵界或沼泽标准的标量场势的斜率。此外,我们说明,这样的模型面临着一个优雅的出口问题:任何补丁的空间,退出永恒的通货膨胀的区域是不是不够大,以解释宇宙微波背景的各向同性,或有一个频谱的波动与不可接受的大红色倾斜。
It has been suggested that low energy effective field theories should satisfy given conditions in order to be successfully embedded into string theory. In the case of a single canonically normalized scalar field this translates into conditions on its potential and the derivatives thereof. In this Letter we revisit small field hilltop models of eternal inflation including stochastic effects and study the compatibility of the swampland constraints with entropy considerations. We show that these stochastic inflation scenarios either violate entropy bounds or the swampland criterion on the slope of the scalar field potential. Furthermore, we illustrate that such models are faced with a graceful exit problem: any patch of space which exits the region of eternal inflation is either not large enough to explain the isotropy of the cosmic microwave background, or has a spectrum of fluctuations with an unacceptably large red tilt.
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