Trans-Planckian censorship, inflation, and dark matter
Trans-Planckian censorship, inflation, and dark matter
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跨普朗克审查制度、通货膨胀和暗物质
DOI：
10.1103/physrevd.101.063517
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发表时间：
2019
影响因子：
5
通讯作者：
Tommi Tenkanen
中科院分区：
文献类型：
--
作者：
Tommi Tenkanen
如果暴胀阶段持续的时间长于最短周期，那么今天观察到的长度尺度源自暴胀期间小于普朗克长度的模态。最近有人认为，这种“跨普朗克问题”永远不会出现在一致的弦理论框架中，该框架对通货膨胀的能量规模 $V^{1/4}\lesssim 10^9$ GeV 施加了严格的限制。在本文中，我们表明这一要求对应于暴胀期间非常小的哈勃尺度，$H_{\rm inf}\lesssim 1$ GeV，因此对暴胀期间量子涨落放大产生暗物质密度的场景产生严重后果。我们还提出了一类通货膨胀模型，它既满足上述通货膨胀规模的限制，又与观测数据完全一致。
If the inflationary phase lasted longer than the minimal period, the length scales observed today originate from modes that were smaller than the Planck length during inflation. It was recently argued that this "trans-Planckian problem" can never arise in a consistent string theory framework, which places a stringent constraint on the energy scale of inflation, $V^{1/4}\lesssim 10^9$ GeV. In this paper, we show that this requirement corresponds to a very small Hubble scale during inflation, $H_{\rm inf}\lesssim 1$ GeV, and therefore has serious consequences on scenarios where the dark matter density was generated by amplification of quantum fluctuations during inflation. We also present a class of inflationary models which both satisfy the above limit for the scale of inflation and are in perfect agreement with observational data.