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arXiv 0907.2916hep-th
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由轴子单值暴胀引起的CMB的振荡

Oscillations in the CMB from Axion Monodromy Inflation

Raphael Flauger, Liam McAllister, Enrico Pajer, Alexander Westphal, Gang Xu

摘要:

研究轴子单值暴胀中的CMB观测量。在弦论中,暴胀的这些动机很好的场景在超普朗克场范围内具有单项式势,并叠加了来自瞬子效应的正弦调制。这种势的周期性调制可以驱动宇宙学扰动的关联函数的共振增强,振幅的特征调制是波数的函数。我们给出了这类模型的标量功率谱的分析结果,我们确定的限制,目前的数据放置在调制的幅度和频率。然后,结合对弦论中轴子单值暴胀实现的进一步理解,我们仔细研究了这种情况下的微物理约束。我们发现,可检测调制的标量功率谱是常见的控制良好的例子,而共振贡献的双谱是不可检测的,在某些类别的例子和其他检测。我们的结论是共振贡献的频谱和双谱是一个特征签名的轴子单值膨胀,在有利的情况下,可以检测到在不久的将来的实验。

英文摘要:

We study the CMB observables in axion monodromy inflation. These well-motivated scenarios for inflation in string theory have monomial potentials over super-Planckian field ranges, with superimposed sinusoidal modulations from instanton effects. Such periodic modulations of the potential can drive resonant enhancements of the correlation functions of cosmological perturbations, with characteristic modulations of the amplitude as a function of wavenumber. We give an analytical result for the scalar power spectrum in this class of models, and we determine the limits that present data places on the amplitude and frequency of modulations. Then, incorporating an improved understanding of the realization of axion monodromy inflation in string theory, we perform a careful study of microphysical constraints in this scenario. We find that detectable modulations of the scalar power spectrum are commonplace in well-controlled examples, while resonant contributions to the bispectrum are undetectable in some classes of examples and detectable in others. We conclude that resonant contributions to the spectrum and bispectrum are a characteristic signature of axion monodromy inflation that, in favorable cases, could be detected in near-future experiments.

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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