Axion cosmology and the energy scale of inflation
Axion cosmology and the energy scale of inflation
复制标题
轴子宇宙学和暴涨的能量规模
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
F. Wilczek
中科院分区：
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作者：
M. Hertzberg;M. Tegmark;F. Wilczek
我们考察了暴胀和轴子参数空间的观测约束，并绘制了两个允许的窗口：经典窗口和暴胀人类窗口。后者的宇宙学特别有趣；暴胀轴子宇宙学预测宇宙微波背景中存在等曲率波动，其振幅随着暴胀的能量尺度和轴子中暗物质的比例而增长。统计论据倾向于后者的实质性值，因此当前等曲率波动的界限意味着对通货膨胀的严格约束。例如，10{sup 16} GeV的轴子Peccei-Quinn尺度排除了任何能量尺度为>3.8x10{sup 14} GeV （r>2x10{sup -9}）的95%置信的暴胀模型，因此意味着暴胀产生的引力波可以忽略不计，但表明可以察觉到等曲率波动。
We survey observational constraints on the parameter space of inflation and axions and map out two allowed windows: the classic window and the inflationary anthropic window. The cosmology of the latter is particularly interesting; inflationary axion cosmology predicts the existence of isocurvature fluctuations in the cosmic microwave background, with an amplitude that grows with both the energy scale of inflation and the fraction of dark matter in axions. Statistical arguments favor a substantial value for the latter, and so current bounds on isocurvature fluctuations imply tight constraints on inflation. For example, an axion Peccei-Quinn scale of 10{sup 16} GeV excludes any inflation model with energy scale >3.8x10{sup 14} GeV (r>2x10{sup -9}) at 95% confidence, and so implies negligible gravitational waves from inflation, but suggests appreciable isocurvature fluctuations.