Drifting oscillations in axion monodromy
Drifting oscillations in axion monodromy
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DOI：
10.1088/1475-7516/2017/10/055
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发表时间：
2014-12
影响因子：
6.4
通讯作者：
R. Flauger;L. McAllister;E. Silverstein;A. Westphal
中科院分区：
文献类型：
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作者：
R. Flauger;L. McAllister;E. Silverstein;A. Westphal
我们研究了轴子单值膨胀中原始功率谱的振荡模式，占振荡周期的漂移，这对于与宇宙学数据进行比较非常重要。在这些模型中，势能在超普朗克场范围内具有单项式形式，叠加调制的大小取决于模型。调制的幅度和频率由模场的期望值决定。我们表明，在通货膨胀的过程中，能量密度的减少可以引起缓慢的调整的模量，改变调制。我们提供的模板捕捉漂移模量的影响，以及漂移产生的有效场理论模型的基础上软破离散移位对称性，我们估计所需的精度检测漂移期间。非漂移模板在宽范围的参数上是足够的，但是对于感兴趣的最高频率，或者对于足够强的漂移，有必要包括表征频率在CMB中可见的e折叠上的变化的参数。我们使用这些模板进行初步的搜索漂移振荡的普朗克名义使命数据中的参数空间的一部分。
We study the pattern of oscillations in the primordial power spectrum in axion monodromy inflation, accounting for drifts in the oscillation period that can be important for comparing to cosmological data. In these models the potential energy has a monomial form over a super-Planckian field range, with superimposed modulations whose size is model-dependent. The amplitude and frequency of the modulations are set by the expectation values of moduli fields. We show that during the course of inflation, the diminishing energy density can induce slow adjustments of the moduli, changing the modulations. We provide templates capturing the effects of drifting moduli, as well as drifts arising in effective field theory models based on softly broken discrete shift symmetries, and we estimate the precision required to detect a drifting period. A non-drifting template suffices over a wide range of parameters, but for the highest frequencies of interest, or for sufficiently strong drift, it is necessary to include parameters characterizing the change in frequency over the e-folds visible in the CMB. We use these templates to perform a preliminary search for drifting oscillations in a part of the parameter space in the Planck nominal mission data.