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arXiv 1301.2630hep-thastro-ph.COhep-ph
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反常维数与非高斯性

Anomalous Dimensions and Non-Gaussianity

Daniel Green, Matthew Lewandowski, Leonardo Senatore, Eva Silverstein, Matias Zaldarriaga

摘要:

我们分析的通货膨胀模型的签名,耦合到强相互作用的场论,一类基本的多场模型,也有动机的作用,在提供动态小尺度。在双谱的压缩极限附近,我们发现了一个简单的标度行为,它由适当的么正性边界所约束的算子维数所决定。具体来说,我们分析了两个简单的和可计算类的例子:共形场论(CFTs),和相关的时间相关的双迹运营商变形的大N CFTs。这两类例子一起表现出广泛的缩放和形状的双谱,包括近等边,正交和局部非高斯在不同的制度。一路上,我们比较和对比的形状和振幅与以前的结果弱耦合场耦合到通货膨胀。这个签名提供了一个精确的测试强耦合部门耦合到通货膨胀通过不相关的运营商抑制高质量规模高达1000倍的通货膨胀哈勃尺度。

英文摘要:

We analyze the signatures of inflationary models that are coupled to strongly interacting field theories, a basic class of multifield models also motivated by their role in providing dynamically small scales. Near the squeezed limit of the bispectrum, we find a simple scaling behavior determined by operator dimensions, which are constrained by the appropriate unitarity bounds. Specifically, we analyze two simple and calculable classes of examples: conformal field theories (CFTs), and large-N CFTs deformed by relevant time-dependent double-trace operators. Together these two classes of examples exhibit a wide range of scalings and shapes of the bispectrum, including nearly equilateral, orthogonal and local non-Gaussianity in different regimes. Along the way, we compare and contrast the shape and amplitude with previous results on weakly coupled fields coupled to inflation. This signature provides a precision test for strongly coupled sectors coupled to inflation via irrelevant operators suppressed by a high mass scale up to 1000 times the inflationary Hubble scale.

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