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arXiv · 1707.00813

A viable D-term hybrid inflation

Kenji Kadota·Tatsuo Kobayashi·Keigo Sumita
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Abstract

We propose a new model of the D-term hybrid inflation in the framework of supergravity. Although our model introduces, analogously to the conventional D-term inflation, the inflaton and a pair of scalar fields charged under a $U(1)$ gauge symmetry, we study the logarithmic and exponential dependence on the inflaton field, respectively, for the K\"ahler and superpotential. This results in a characteristic one-loop scalar potential consisting of linear and exponential terms, which realizes the small-field inflation dominated by the Fayet-Iliopoulos term. With the reasonable values for the coupling coefficients and, in particular, with the $U(1)$ gauge coupling constant comparable to that of the Standard Model, our D-term inflation model can solve the notorious problems in the conventional D-term inflation, namely, the CMB constraints on the spectral index and the generation of cosmic strings.

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Kenji Kadota, Tatsuo Kobayashi, Keigo Sumita. 2017-07-04. A viable D-term hybrid inflation. https://doi.org/10.1088/1475-7516%2F2017%2F11%2F033

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