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arXiv 0810.0270astro-ph
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慢卷暴胀模型的非正则推广

Non-canonical generalizations of slow-roll inflation models

Konstantinos Tzirakis, William H. Kinney

摘要:

我们考虑两类简单单场暴胀模型的非正则推广。首先,我们研究了“超慢滚”暴胀的非正则版本,这是一类暴胀模型,量子模式在视界交叉时不会冻结,而是在超视界尺度上迅速演化。其次,我们考虑最简单的“混沌”通货膨胀的情况下,与一个潜在的占主导地位的四次(质量)项的暴胀的非正则推广。我们发现了一类相关的非正则解与多项式的潜力,但与不同的声速。这些解决方案的特点是由一个恒定的场速度,我们把这样的模型{ \it isokinetic}通货膨胀。和正则极限一样,等速暴胀的功率谱也略微向红倾斜,这与当前的数据一致。然而,与正则情况不同的是,这些模型可以具有任意小的张量/标量比。特别令人感兴趣的是,等速暴胀的特点是张量/标量比和非高斯振幅之间的相关性,使得具有小张量/标量比的参数区域具有{ \it large}相关的非高斯性,这是一个独特的观测特征。

英文摘要:

We consider non-canonical generalizations of two classes of simple single-field inflation models. First, we study the non-canonical version of "ultra-slow roll" inflation, which is a class of inflation models for which quantum modes do not freeze at horizon crossing, but instead evolve rapidly on superhorizon scales. Second, we consider the non-canonical generalization of the simplest "chaotic" inflation scenario, with a potential dominated by a quartic (mass) term for the inflaton. We find a class of related non-canonical solutions with polynomial potentials, but with varying speed of sound. These solutions are characterized by a constant field velocity, and we dub such models {\it isokinetic} inflation. As in the canonical limit, isokinetic inflation has a slightly red-tilted power spectrum, consistent with current data. Unlike the canonical case, however, these models can have an arbitrarily small tensor/scalar ratio. Of particular interest is that isokinetic inflation is marked by a correlation between the tensor/scalar ratio and the amplitude of non-Gaussianity such that parameter regimes with small tensor/scalar ratio have {\it large} associated non-Gaussianity, which is a distinct observational signature.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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