Hypernatural inflation Article Swipe
YOU?
·
· 2018
· Open Access
·
· DOI: https://doi.org/10.1088/1475-7516/2018/07/035
· OA: W2796323730
We constructed a model of natural inflation in the context of\n$\\alpha$-attractor supergravity, in which both the dilaton field and the axion\nfield are light during inflation, and the inflaton may be a combination of the\ntwo. The T-model version of this theory is defined on the Poincare disk with\nradius |Z| = 1. It describes a Mexican hat potential with the flat axion\ndirection corresponding to a circle of radius |Z| < 1. The axion decay constant\n$f_{a}$ in this theory can be exponentially large because of the hyperbolic\ngeometry of the Poincare disk. Depending on initial conditions, this model may\ndescribe $\\alpha$-attractor inflation driven by the radial component of the\ninflaton field, natural inflation driven by the axion field, or a sequence of\nthese two regimes. We also construct the E-model version of this theory, which\nhas similar properties. In addition, we describe generalized $\\alpha$-attractor\nmodels where the potential can be singular at the boundary of the moduli space,\nand show that they can provide a simple solution for the problem of initial\nconditions for the models with plateau potentials.\n
