A viable D-term hybrid inflation model

Kenji Kadota, Tatsuo Kobayashi, Keigo Sumita

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)

    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 Kähler 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.

    Original languageEnglish
    Article number033
    JournalJournal of Cosmology and Astroparticle Physics
    Volume2017
    Issue number11
    DOIs
    Publication statusPublished - 2017 Nov 21

    Keywords

    • inflation
    • string theory and cosmology
    • supersymmetry and cosmology

    ASJC Scopus subject areas

    • Astronomy and Astrophysics

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