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arXiv 0910.2237astro-ph.COhep-ph
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大功率谱特征的广义慢滚

Generalized Slow Roll for Large Power Spectrum Features

Cora Dvorkin, Wayne Hu

摘要:

我们开发了一个变种的广义慢滚方法计算的曲率功率谱是非常适合的顺序单位偏差所造成的尖锐功能的暴胀子潜在的权力。作为一个例子,我们表明,预测的阶跃函数的潜力,这已被提出来解释在多极l=20-40的CMB温度功率谱的顺序单位毛刺,是准确的百分比水平。我们的分析表明,良好的近似有一个单一的源函数,负责可观察到的功能,这个功能是简单地与当地的斜率和曲率的暴胀子潜力。这些属性应使广义慢滚近似有用的通货膨胀模型独立的功能,无论是大的和小的,在可观察的功率谱的研究。

英文摘要:

We develop a variant of the generalized slow roll approach for calculating the curvature power spectrum that is well-suited for order unity deviations in power caused by sharp features in the inflaton potential. As an example, we show that predictions for a step function potential, which has been proposed to explain order unity glitches in the CMB temperature power spectrum at multipoles l=20-40, are accurate at the percent level. Our analysis shows that to good approximation there is a single source function that is responsible for observable features and that this function is simply related to the local slope and curvature of the inflaton potential. These properties should make the generalized slow roll approximation useful for inflation-model independent studies of features, both large and small, in the observable power spectra.

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