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arXiv 1104.4500astro-ph.COhep-ph
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非正则动力学项的广义慢滚

Generalized Slow Roll for Non-Canonical Kinetic Terms

Wayne Hu

摘要:

我们表明,广义慢滚方法计算的功率谱的膨胀慢滚参数既不小,也不缓慢变化,可以很容易地扩展到模型与非正则动力学项的暴胀作用。例如,在DBI模型中可能出现快速声速变化,其中翘曲因子中的特征导致功率谱中的特征。尽管如此,仍然有一个简单地与功率谱相关的偏差源函数。这个源函数的经验约束可以很容易地解释在暴胀子潜力或声速的功能的上下文中。

英文摘要:

We show that the generalized slow-roll approach for calculating the power spectrum where the inflationary slow roll parameters are neither small nor slowly varying can be readily extended to models with non-canonical kinetic terms in the inflaton action. For example, rapid sound speed variations can arise in DBI models with features in the warp factor leading to features in the power spectrum. Nonetheless there remains a single source function for deviations that is simply related to the power spectrum. Empirical constraints on this source function can be readily interpreted in the context of features in the inflaton potential or sound speed.

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