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arXiv 1507.08481astro-ph.COgr-qchep-phhep-th
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原始光谱中尖锐特征的一致性关系

Consistency relations for sharp features in the primordial spectra

Sander Mooij, Gonzalo A. Palma, Grigoris Panotopoulos, Alex Soto

摘要:

我们研究的原始光谱的有效场论的框架内的尖锐功能的产生的通货膨胀,其中曲率扰动是一个单一的标量自由度的动力学的后果。我们确定了两个来源的功能的产生:快速变化的声速c_s(曲率波动传播)和膨胀过程中的膨胀率H的快速变化。考虑到这一点,我们提出了一个非平凡的关系,连接这两个数量,使我们能够研究在现实的情况下,功能是这两个来源的同时发生的结果尖锐的功能的生成。这种关系取决于一个单一的参数,其值由负责快速变化的背景的特定模型(及其数值输入)确定。因此,我们找到了一个单参数的一致性关系的形状和大小的功能的双谱和功能的功率谱。为了证实这一结果,我们讨论了几个例子的模型,这一单参数关系(c_s和H之间)举行,包括模型中的光谱中的功能都是突然和共振。

英文摘要:

We study the generation of sharp features in the primordial spectra within the framework of effective field theory of inflation, wherein curvature perturbations are the consequence of the dynamics of a single scalar degree of freedom. We identify two sources in the generation of features: rapid variations of the sound speed c_s (at which curvature fluctuations propagate) and rapid variations of the expansion rate H during inflation. With this in mind, we propose a non-trivial relation linking these two quantities that allows us to study the generation of sharp features in realistic scenarios where features are the result of the simultaneous occurrence of these two sources. This relation depends on a single parameter with a value determined by the particular model (and its numerical input) responsible for the rapidly varying background. As a consequence, we find a one-parameter consistency relation between the shape and size of features in the bispectrum and features in the power spectrum. To substantiate this result, we discuss several examples of models for which this one-parameter relation (between c_s and H) holds, including models in which features in the spectra are both sudden and resonant.

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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