Axions, inflation and the anthropic principle

Axions, inflation and the anthropic principle
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轴子、暴胀和人择原理

DOI:
10.1088/1475-7516/2011/07/021
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发表时间:
2011
影响因子:
6.4
通讯作者:
Mack K
Mack K
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Mack K

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QCD轴子是强CP问题的主要解决方案,是暗物质的候选者,也是弦理论紧化的可能结果。然而,对于在暴胀之前产生的轴子,f a 10 12 GeV的破缺尺度(这在弦理论轴子模型中是有利的)被宇宙学约束排除了,除非轴子失准角θ 0和暴胀哈勃尺度H I都被非常精细地调整。我们表明,试图容纳一个高f的轴子在暴胀宇宙学导致的微调问题,比强CP问题的轴子最初发明解决。我们还表明,这个问题仍然没有得到解决的人择选择参数通常适用于高f的轴子的情况。
The QCD axion is the leading solution to the strong-CP problem, a dark matter candidate, and a possible result of string theory compactifications. However, for axions produced before inflation, symmetry-breaking scales of f a≳ 10 12 GeV (which are favored in string-theoretic axion models) are ruled out by cosmological constraints unless both the axion misalignment angle θ 0 and the inflationary Hubble scale H I are extremely fine-tuned. We show that attempting to accommodate a high-f a axion in inflationary cosmology leads to a fine-tuning problem that is worse than the strong-CP problem the axion was originally invented to solve. We also show that this problem remains unresolved by anthropic selection arguments commonly applied to the high-f a axion scenario.
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DOI: 10.1088/1126-6708/2008/06/056
发表时间: 2008
期刊: arXiv: High Energy Physics - Theory
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