Abstract
Planck data robustly exclude the simple λϕ4 scenario for inflation. This is also the case for models of “Axion Inflation” in which the inflaton field is the radial part of the Peccei-Quinn complex scalar field. In this letter we show that for the KSVZ model it is possible to match the data taking into account radiative corrections to the tree level potential. After writing down the 1-loop Coleman-Weinberg potential, we show that a radiative plateau is easily generated thanks to the fact that the heavy quarks are charged under SU(3)c in order to solve the strong CP problem. We also give a numerical example for which the inflationary observables are computed and the heavy quarks are predicted to have a mass mQ≳102TeV.
Highlights
The nature of the inflaton field [56,45] responsible to the initial acceleration of the universe remains unknown
An intriguing possibility is that the field responsible of inflation is able to solve some of the others issues we face in the standard model of particle physics
In this letter we study the possibility that the inflaton is the complex scalar field associated with the Peccei-Quinn symmetry; the presence of this field is justified to solve the strong CP problem and incidentally generates a very promising dark matter candidate, the axion
Summary
The nature of the inflaton field [56,45] responsible to the initial acceleration of the universe remains unknown. A simple possibility to lower the tensor to scalar ratio r is found in model in which the inflaton couples to the Ricci scalar [15,55,36,38,57,61,56,52,51] This possibility, in the contest of “Axion Inflation”, was already studied e.g. in [12,35], where the authors showed that the non minimal coupling to gravity ξφ can flatten the potential at large values and reconcile predictions with data. The considered model is a typical inflection-point inflation, which has already been considered in other contests ([60,59,25,34]), here for the first time we considered it in a very well motivated scenario as the KSVZ model
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