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arXiv 1507.08360astro-ph.COgr-qchep-phhep-th
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有效场论激发的单值暴胀中普朗克抑制算符的功率谱振荡

Power spectrum oscillations from Planck-suppressed operators in effective field theory motivated monodromy inflation

Layne C. Price

备注：
12 pages, 6 figures; matches published version
发表信息：
Phys. Rev. D 92, 103507 (2015)
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摘要：

我们考虑暴胀的唯象模型，其中暴胀子是复标量场$Φ$的相位。$\mathcal O(f^5/M_\mathrm{pl})$的普朗克抑制算符在衰变常数$f$的一阶上修改vev $\langle Φ\rangle$的几何形状，这在正则归一化暴胀子$ϕ$的定义中增加了一阶周期项。这种对暴胀子的修正在势$V \sim θ^p$中引入了固定数目的额外振荡项。我们在一个玩具场景中得出了同样的结果，其中真空$\langle Φ\rangle$是具有任意大偏心率的椭圆。这些额外的振荡改变了功率谱的形式作为尺度$k$的函数，并提供了一种可能的机制，用于区分EFT激发的暴胀与角位移对称性是规范对称性的模型。

英文摘要：

We consider a phenomenological model of inflation where the inflaton is the phase of a complex scalar field $Φ$. Planck-suppressed operators of $\mathcal O(f^5/M_\mathrm{pl})$ modify the geometry of the vev $\langle Φ\rangle$ at first order in the decay constant $f$, which adds a first order periodic term to the definition of the canonically normalized inflaton $ϕ$. This correction to the inflaton induces a fixed number of extra oscillatory terms in the potential $V \sim θ^p$. We derive the same result in a toy scenario where the vacuum $\langle Φ\rangle$ is an ellipse with an arbitrarily large eccentricity. These extra oscillations change the form of the power spectrum as a function of scale $k$ and provide a possible mechanism for differentiating EFT-motivated inflation from models where the angular shift symmetry is a gauge symmetry.

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