Hypernatural inflation
Hypernatural inflation
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DOI：
10.1088/1475-7516/2018/07/035
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发表时间：
2018-03
影响因子：
6.4
通讯作者：
Andrei Linde;Dong-Gang Wang;Y. Welling;Y. Yamada;A. Achúcarro
中科院分区：
文献类型：
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作者：
Andrei Linde;Dong-Gang Wang;Y. Welling;Y. Yamada;A. Achúcarro
在α-吸引子超引力的背景下，我们构造了一个自然暴胀模型，其中暴胀过程中介子场和轴子场都是轻的，暴胀子可能是两者的结合.该理论的T模型版本定义在半径为|Z| = 1。它描述了一个墨西哥帽势，其平坦的轴子方向对应于半径为的圆|Z| < 1。由于庞加莱盘的双曲几何，这个理论中的轴子衰减常数fa可以是指数级的大。根据初始条件，这个模型可以描述由暴胀子场的径向分量驱动的α吸引子暴胀，由轴子场驱动的自然暴胀，或者这两种状态的序列。我们还构造了这个理论的E模型版本，它们具有类似的性质。此外，我们还描述了广义α-吸引子模型，其中势在模空间的边界处可以是奇异的，并证明了它们可以为具有平台势的模型的初始条件问题提供一个简单的解决方案.
We construct a model of natural inflation in the context of α-attractor supergravity, in which both the dilaton field and the axion field are light during inflation, and the inflaton may be a combination of the two. The T-model version of this theory is defined on the Poincaré disk with radius |Z| = 1. It describes a Mexican hat potential with the flat axion direction corresponding to a circle of radius |Z| < 1. The axion decay constant fa in this theory can be exponentially large because of the hyperbolic geometry of the Poincaré disk. Depending on initial conditions, this model may describe α-attractor inflation driven by the radial component of the inflaton field, natural inflation driven by the axion field, or a sequence of these two regimes. We also construct the E-model version of this theory, which have similar properties. In addition, we describe generalized α-attractor models where the potential can be singular at the boundary of the moduli space, and show that they can provide a simple solution for the problem of initial conditions for the models with plateau potentials.