Cosmological Attractors from $α$-Scale Supergravity
Cosmological Attractors from $α$-Scale Supergravity
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DOI：
10.1103/physrevd.92.043525
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发表时间：
2015-03
影响因子：
5
通讯作者：
D. Roest;M. Scalisi
中科院分区：
文献类型：
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作者：
D. Roest;M. Scalisi
光谱指数的普朗克值可以解释为 $n_s = 1 - 2/N$（以 e 折叠数 $N$ 计）。 $\alpha$-吸引子为这种现象学观察提供了一个有吸引力的解释：这些超重力模型的暴胀预测完全由卡勒流形的曲率决定。我们提供了一种新颖的 $\alpha$-吸引子公式，它只涉及单个手性超场。我们的构建涉及无比例模型的自然变形，并利用它们构建具有指数下降的德西特高原。最后，我们展示了具有平面卡勒几何的类似结构如何作为此类 $\alpha$ 尺度模型的奇异极限而出现。
The Planck value of the spectral index can be interpreted as $n_s = 1 - 2/N$ in terms of the number of e-foldings $N$. An appealing explanation for this phenomenological observation is provided by $\alpha$-attractors: the inflationary predictions of these supergravity models are fully determined by the curvature of the Kahler manifold. We provide a novel formulation of $\alpha$-attractors which only involves a single chiral superfield. Our construction involves a natural deformation of no-scale models, and employs these to construct a De Sitter plateau with an exponential fall-off. Finally, we show how analogous structures with a flat Kahler geometry arise as a singular limit of such $\alpha$-scale models.